西南大学博士入学考试英语试题(2012) L{;Q6_
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Part I Vocabulary (10 points) o[JZ>nm
Directions: In this part there are 20 incomplete sentences. For each sentence there zA|lbJz=GY
are four choices marked A, B, C and D. Choose the one that best completes the 3 %r*~#nz
following sentences. Then blacken the corresponding letter on the Answer Sheet ZF#lh]
1. A broadcasting station will sometimes to its listeners a programme which RxV
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it has received from another station. hWn-[w/l_
. N5#j}tT
A. rely B. relay C. relate D. reside l.;^w
2. The United Nations Conference on Drug Abuse, which took place earlier this year 9P#kV@%(0c
in Vienna, was a very meeting. i8
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A. productive B. overwhelming C. compulsory D. protective @kT@IQkri
3. A person who studies ___ learns how to express numbers approximately and Y)(w&E>1
how to calculate ratios and averages. }a UQ#x
A. static B. statistic C. statistics D. status \ ux{J
4. If you ______ someone, you form a fixed general idea or image of them so that C!v%6[
you assume that they will behave in a particular way. KG(l=? N
A. assimilate B. simulate C. stereotype D. subordinate /UR;,ts
5. Reading ______ the mind only with materials of knowledge, it is thinking that zrE{CdG%y
makes what we read ours. UT 7'-
A. rectifies B. prolongs C. furnishes D. minimizes :To{&T
6. Satellite communications are so up-to-date that even when _____ in the middle ?vik2RW
of the Pacific, businessman can contact their offices as if they were next door. L"T :#>
A. gliding B. cruising C. piloting D. patrolling "9 vL+Hh
7. Now a paper in Science argues that organic chemicals in the rock come mostly YiL^KK
from _______ on earth rather than bacteria on Mars. x
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A. configuration B. constitution C. condemnation D. contamination Sq2 8=1%
8. Scientists, who are now aware of how nautiluses regulate their buoyancy, have I~ mu'T
been able to dispel ideas about these creatures.
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A. erroneous B. misdemeanors C. misgivings D. misdirection x],XiSyp
9. History has demonstrated that countries with different social systems and ]R09-s 0$7
ideologies can join hands in meeting the common challenges to human _____ and Cnu])R
development. '
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A. evolution B. survival C. rivalry D. dignity i\4YT r,
10. To avoid an oil shortage, we should advocate that more machines must _____ of 1p-<F3;
life in a short time, and this made others astonished. x'Nc
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A. accelerate B. operate C. generate D. utilize 02:`Joy2D
11. Japanese leaders aboard the U. S. battleship Missouri and signed the ____ Smh=Q4,W
surrender, which ended World War Two in 1945. 8|!"CQJ|H
A. conditional B. infinite C. everlasting D. unconditional ( pCU:'"
12. It is a _____ that in such a rich country there should be so many poor people who R=iwp%c(
could hardly keep their body and soul together. G]Im.x3O-
A. hypothesis B. paradox C. conflict D. dispute cwHbm%
13. The _____ effects of many illnesses made him a weak man and he still didn’t r"VNq&v]9
want to do sports every day. cw_B^f8^
A. cumulative B. formidable C. eternal D. prospective *^Z -4
14. The robbers broke into the bank, _____ the clerics with revolvers and forced them w H`GzB"
to give money just as they were about to knock off. -_
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A. shot B. frightened C. amused D. menaced {yxLL-5c
15. This pair of boots cost much less than yours for I bought them when the +R8dy
department store made a _____ of the stored goods. jS#YqVuN
A. clearance B. reduction C. fortune D. deal W:8{}Iu<
16. Technology has _____ the sharing information and the storage and delivery of W$z^U)|t
information, thus making more information available to more people. Q[T)jo,j%
A. formulated B. facilitated C. furnished D. functioned ' 1dhdm8
17. Language, culture and personality may be considered _____ of each other I thought, -(#`JT8
but they are inseparable in fact. +Q :)zE
A. indistinctly B. separately C. irrelevantly D. independently b:
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18. More than 85 percent of French Canada’s population speaks French as a mother {JfL7%
tongue and _____ to the Roman Catholic faith. YTfi g{a
A. caters B. adheres C. ascribes D. subscribes *M$$%G(4
19. There are not many teachers who are strong _____ of traditional methods in Ud#xgs'
English teaching. =<P$mFP2*
A. sponsors B. contributors C. advocates D. performers ^>y|{;`
20. The ______ of the scientific attitude is that the human mind can succeed in 0p*Oxsy
understanding the universe. WjvgDNk
A. essence B. content C. texture D. threshold DeQZDY //
Part II Reading Comprehension (30 points) qMd4awB
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Directions: z;&J9r$`
Questions 21 to 25 are based on the following passage. IL%P\Zs
There are 6 reading passages in this part. Each passage is followed by - G=doP0
some questions or unfinished statements. For each of them there are four choices *M6j)jqV
marked A, B, C and D. you should decide on the best choice and mark your answer on * YLpC^&
the Answer Sheet. "~08<+
Spread across the United States are about 500,000 doctors, cheeked by jowl, in the <4"Bb_U
big cities and thin on the ground in isolated small towns. In June 1986, the secretary #0Z%4W Q
of health and human services, Dr. Otis Bowen, passed on a view of his experts: 5%-15% w!Ii
of America’s 500,000 doctors should be candidates for disciplinary action, many of X9YbTN
them because of drug taking or alcoholism. Others give their patients poor care #*"I?B/fd8
because they are senile, incompetent, guilty of misconduct or out of touch with l~x
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developments in medicine. *3y_FTh8ra
The granting, or withdrawal, of licenses to practice is in the hands of state medical uA\KbA.c;U
boards, but they are overwhelmed with complaints and lack the money to handle even 4CxU
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a fraction of them. Recently, however, things have been changing. In 1985, 406 $KsB'BZy
doctors lost their licenses (compared with 255 in 1984), nearly 500 were placed on 'D^@e0.3
probation and nearly 1,000 received reprimands or had their right to practice curtailed. xv_Z$&9e>l
The federal inspector general demanded, and won the right far the states and the [4mIww%
federal government, which provide health care for the elderly and for the poor under pH396GFIW
the Medicare and Medicaid programme, to refuse payment to the doctors considered ~@D{&7@
unsatisfactory. 41i#w;ojI
Yet putting these powers into practice is proving to be far from easy. O f the 35 ;Hu`BFXyD
doctors so far denied reimbursement from Medicare, almost all work in lightly 2-rfFqpe
populated rural areas. O n March 27th, their indignation and that of their patients were `Oe}OSxnT
a sympathetic hearing by the Senate Finance Committee. Rural doctors may not be as t'HrI-x
up to date as those in the big towns, but they are often the only source of medical help rKr\Qy+q
for miles around and their patients are loyal to them. Members of the review boards, ;@< e ]Ft
which are paid by the government, insist, however, that elderly and poor people Yi|Nd ;
should not be forced to receive (and the state to pay for) inferior care. .s3y^
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An innovation is on the horizon in Texas, the most under-doctored state in the ^7Z.~A y
country (with only one doctor for every 1,100 residents). Lubbock University is ifadnl26
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setting up a computer network that will enable country doctors to obtain medical eMU t%zvb
expertise and access to medical records in a hurry. The aim is to reduce the isolation kp,$ NfD
of the country doctors and thus, in the long run, to attract more young doctors to rural <a&$D
areas. wU&vkb)k
21. The main topic of the passage is . knRs{1}Pw{
A. the present situation of American doctors x,QXOh\a
B. the legislation on rural medical services Tuy5
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C. the problems of country doctors and possible solutions e^-C
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D. some factors of disqualification of country doctors le~p2l#e
22. According to the text, disciplinary action should be taken against those who pUeok+k_
give patients poor care because of the following reasons EXCEPT . rC6{-42bb
A. taking drugs and drinking alcohol *NoixV1>
B. feeling remorse of their bad behavior i0&W}Bb'
C. being professional unskillful 4X$|jGQ\
D. being sick and conservative GNoUn7Y
23. Which of the following is true about the unfit doctors? nRheByYm
A. 1,500 doctors were deprived of the right to practice medicine. fD2)/5j1
B. The federal government has got the right to deny reimbursement to those 0W]vK$\F*
unqualified doctors. 6Vu)
C. Almost all the doctors who fail to get payment from Medicare work in NoT%z$1n
densely populated urban areas. H~lvUHN
D. Patients in the rural areas complain about the poor treatment their doctors =8Gpov1!V~
give them. x]~&4fp
24. It can be inferred from the text that in the near future . :} D TK
A. there will be more qualified doctors in rural areas iB5'mb
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B. there will be an even more serious imbalance of the number of rural and I"HA(
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urban doctors 0G(|`xG1q
C. country doctors are competitive in breaking medical records y`J8ha
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D. more patients will go to rural areas for medical treatment mD;ioaE
25. The paragraph following the text would probably discuss . b$>1_wTL
A. problems of urban doctors axz.[L_elB
B. other solutions to improve the present situation Z~ u3{
C. research in medical science {ukQBu#}<
D. reduction of staff in rural hospitals N;i\.oY
Questions 26 to 30 are based on the following passage. [rReBgV
Bacteria are extremely small living things. While we measure our own sizes in | *N;R+b
inches or centimeters, bacterial size is measured in microns. O ne micron is a T
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thousandth of a millimeter: a pinhead is about a millimeter across. Rod-shaped
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bacteria are usually from two to four microns long, while rounded ones are generally %\Mc6
one micron in diameter. Thus, if you enlarged a rounded bacterium a thousand times, Dfy=$:Q
it would be just about the size of a pinhead. An adult human magnified by the same
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amount would be over a mile (1.6 kilometers) tall. zEi\#Zg$
Even with an ordinal microscopy, you must look closely to see bacteria. Using a B{>x
magnification of 100 times, one finds that bacteria are barely visible as tiny rods or OOnhT
dots. One cannot make out anything of their structure. Using special stains, one can k \\e`=
see that some bacteria have attached to them wavy-looking “hairs” called flagella. j8;Uny9
Others have only one flagellum. The flagella rotate, pushing the bacteria through the 3e)$ <e
water. Many bacteria lack flagella and cannot move about by their own power, while Em(Okr,0
others can glide along over surfaces by some little-understood mechanism. 3;3 cTXR?=
From the bacterial point of view, the world is a very different place from what it is ~
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to humans. To a bacterium, water is as thick as molasses is to us. Bacteria are so small \w)ddc!ZS
that they are influenced by the movements of the chemical molecules around them. t\f[->f
Bacteria under the microscope, even those with no flagella, often bounce about in +NVXFjPC
the water. This is because they collide with the water molecules and are pushed this q2*1Gn9!j
way and that. Molecules move so rapidly that within a tenth of a second the molecules
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around a bacterium have all been replaced by new ones; even bacteria without flagella @ ?bY,
are thus constantly exposed to a changing environment. |qpFR)l
26. Which of the following is the main topic of the passage? ?nZe.z-%6
A. The characteristics of bacteria A[m<xtm5K
B. How bacteria reproduce ZP
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C. The various functions of bacteria oj@=Cq':-
D. How bacteria contribute to disease WAJKP"
27. Bacteria are measured in __________. ~/rKKc
A. Inches !\cVe;<r
B. Centimeters 3rX40>Cs8
C. Microns (6&"(}Pai
D. millimeters Xh }G=1}
28. Which of the following is the smallest? #44}Snz
A. A p inhead c-U]3`;Q
B. A rounded bacterium cUn>gT
C. A microscope t :~,7
D. A rod-shaped bacterium lv+:
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29. According to the passage, someone who examines bacteria using only a ay]l\d2!3
microscope that magnifies 100 times would see ___________. m[Mw2 F
A. tiny dots 4RfBXVS
B. small “hairs” t:b}Mo0
C. large rods y{2\T
D. detailed structures 4gZ)9ya
30. The relationship between a bacterium and its flagella is most nearly analogous to Wl}J=
which of the following? s\p 1EL(
A. A rider jumping on a horse’s back uvJ&qd8M
B. A ball being hit by a bat JL>DRIR%NV
C. A boat powered by a motor p{+F{e
D. A door closed by a gust of wind. 5&xbGEP$
Questions 31 to 35 are based on the following passage. x+b.9f4xJ
Although, recent years have seen substantial reductions in noxious pollutants from `G%h=rr^c
individual motor vehicles, the number of such vehicles has been steadily increasing. Z[>fFg~N4
Consequently, more than 100 cities in the United States still have levels of carbon u?F.%j-
monoxide, particulate matter, and ozone (generated by photochemical, reactions with 3*\hGt,ZP
hydrocarbons from vehicle exhaust) that exceed legally established limits. There is a CeM%?fr5
growing, realization that the only effective way to achieve, further reductions in Q$sC%P(y
vehicle emissions-short of a massive shift away from the private automobile-is to }$g"|;<ha
replace conventional diesel fuel and gasoline with cleaner burning fuels such as AGKT* l.-
compressed natural gas liquefied petroleum gas, ethanol, or methanol. ^ E.mG>
All of these alternatives are carbon-based fuels whose molecules are smaller and mF
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simpler than those of gasoline. These molecules burn more cleanly than gasoline, in D1@yW}
4
part because they have fewer, if and, carbon-carbon bonds, and the hydrocarbons they & eqqgLz
do emit are less likely to generate ozone. The combustion of large molecules, which 5\h 6'
have multiple carbon-carbon bonds, involves a more complex series of reactions. y Pg0:o-
These reactions increase the probability of incomplete combustion and are more likely +ej5C:El_}
to release uncombusted and photochemically active hydrocarbon compounds into the e)m6xiZ
atmosphere. O n the other hand, alternative fuels do have drawbacks. Compressed 1Zi` \N4T
natural gas would require that vehicles have a set of heavy fuel tanks-a serious V]m}xZ'?^
liability in terms of performance and fuel efficiency and liquefied petroleum gas faces {Ppb ;
fundamental limits on supply. N(3Bzd)
Ethanol and methanol, on the other hand, have important advantages over other m(D-?mhL
carbon-based alternative fuels; they have hither energy content per volume and would ivB,s5<
require minimal changes in the existing network for distributing motor fuel. Ethanol is ;=k{[g 'gv
commonly used as a gasoline supplement, but it is currently about twice as expensive %9J:TH9E)
as methanol, the low cost of which is one of its attractive features. Methanol’s most d1D=R8P_u
attractive feature, however, is that it can reduce by about 90 percent the vehicle 4bL? V^@7
emissions that form ozone, the most serious urban air pollutant. }E[vW
Like any alternative fuel, methanol has its critics. Yet much of the criticism is RLzqpE<rJ
based on the use of “gasoline clone” vehicles that do not incorporate even the simplest 0)7v_|z
design improvements that are made possible with the use of methanol. It is true, for Z9q4W:jyS
example, that a given volume of methanol provides only about one-half of the energy N e
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that gasoline and diesel fuel do; other things being equal, the fuel tank would have to ynZEJKo
be somewhat larger and heavier. However, since methanol-fueled vehicles could be WFhppi
designed to be much more efficient than “gasoline clone” vehicles fueled with B9$pG
methanol, they would need comparatively less fuel. Vehicles incorporating only the /-t!)_zvw
simplest of the Engine improvements that methanol makes feasible would still :>Qu;Z1P
contribute to an immediate lessening of urban air pollution. 7FD,TJs
31. The author of the passage is primarily concerned with __________. l!W!Gz0to
A. countering a flawed argument that dismisses a possible solution to a problem. y?A*$6
B. reconciling contradictory points of view about the nature of a problem. R y(<6u0
C. identifying the strengths of possible solutions to a problem. cIa`pU,6A
D. discussing a problem and arguing in favor of one solution to it. *5?Qam3
32. According to the passage, incomplete combustion is more likely to occur with EwgNd Gcj
gasoline than with an alternative fuel because: __________. ~D`R"vzw=
A. the combustion of gasoline releases photochemically active hydrocarbons. "%S-(ue:
B. the combustion of gasoline involves an intricate series of reactions. VS_\bIC
C. gasoline molecules have a simple molecular structure. -o~n06p
D. gasoline is composed of small molecules. O1\25D
33. The passage suggests which of the Following about air pollution? 1zw,;m n
A. Further attempts to reduce emissions from gasoline-fueled vehicles will not -dN`Ok<g
help lower urban air-pollution levels. Z_<NUPE
B. Attempts to reduce the pollutions that an individual gasoline-fueled vehicle -
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emits have been largely unsuccessful. DMs8B&Y=
C. Few serious attempts have been made to reduce the amount of pollutants l@u
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emitted by gasoline-fueled vehicles. f)gV2f0t
D. Pollutants emitted by gasoline-fueled vehicles are not the most critical source xDSiTp=)O
of urban air pollution.
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34. The author describes which of the following as the most appealing feature of $G9E=wn
methanol? T+rym8.p
A. It is substantially less expensive than ethanol. yB=R7E7
B. It could be provided to consumers through the existing motor fuel distribution HU|qeSyel
system.
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C. It has a higher energy content than other alternative fuels. mo=@Zt
D. Its use would substantially reduce ozone levels. $Fy~xMA8O
35. It can be inferred that the author of the passage most likely regards the criticism M9Yov4k,4]
of methanol in the last paragraph as __________. \IzZJGi
A. flawed because of the assumptions on which it is based. p]Qe5@NT
B. inapplicable because of an inconsistency in the critics’ arguments. f,LeJTX=
C. misguided because of its exclusively technological focus. eb,QT\/G
D. invalid because it reflects the personal bias of the critics. +iQ~ Y2Gh
Questions 36 to 40 are based on the following passage. ^L
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Tests of reaction times seemed to back up the notion that the two hemispheres 9ao?\]&t
differed in their processing styles. Researchers used to believe that an image goes to glKPjL *
one hemisphere first, and then to the opposite side of the brain. If the nature of the sk0/3X*Q%
stimulus and the preference of the hemisphere match up, then the person can respond upJy,|5
slightly more quickly and accurately in identifying the local or global image. %?qzP'
Still more startling, researchers found that the same appeared to hold for the brains -GQ.B{%G
of chimps and perhaps other primates. The assumption has always been that V/R@=[
handedness and brain asymmetry are strictly human traits---part of the great brain Bxj4rC[
reorganization that allowed our ancestor to use tools, speak and perhaps even think _+}hId
rationally. But handedness is now widely claimed for primates and even birds, iU~d2R+
amphibians and whales. And in the past few years, some psychologists have tested ?6I`$ &OA
chimps and baboons and suggested their two hemispheres also differ in processing (>Pz3 7
style. t
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Now researchers have come to see the distinction between the two hemispheres as
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a subtle one of processing style, with every mental faculty shared across the brain, and @OHNz!Lj:d
each side contributing in a complementary, not exclusive, fashion. A smart brain y6s/S.
became one that simultaneously grasped both the foreground and the background of Kj6+$l
the moment ypfjF@OT
The next problem was to work out exactly how the brain manages to produce 4L,&a+)
these two contrasting styles. Many researchers originally looked for the explanation in _F8-4
a simple wiring difference within the brain. This theory held that neurons in the left R~N%sn
cortex might make sparse, short-range connections with their neighbors, while cells F{}:e QD
on the other side would be more richly and widely connected The result would be that *S Z]xrs
the representation of sensations and memories would be confined lo smallish, discrete y G>sBc
areas in the left hemisphere, while exactly the same input to a corresponding area of J=n^&y
the right side would form a sprawling even impressionistic pattern of activity. g|!=@9[dv
Supporters of this idea argued that these structural differences would explain why 2Paw*"U
left brain language areas are so good at precise representation of words and word P|aSbsk:I<
sequences while the right brain seems to supply a wider sense of context and meaning. ;:Kc{B.s
A striking finding from some people who suffer right-brain stokes is that they can i{J[;rV9
understand the literal meaning of sentences-their l eft brain can still decode the ?/p."N:]H
words-- -but they can no longer get jokes or allusions. Asked to explain even a %g4)f9>
common proverb, such as “a stitch in time saves nine”, they can only say it must have
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something to do with sewing. An intact right brain is needed to make the more playful %';DBozZ
connections. ]08~bL1Q
36. The local or global image is more quickly and accurately identified in the brain [@s5v
if _______. eA/}$.R
A. tests of reaction times back up the notion of the two hemispheres A
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B. an image goes to one hemisphere first, and then to the opposite side of the 6AmFl<
brain 8ZO~=e
C. the nature of the stimulus and the preference of the hemisphere match up $I/RN
D. the person can match the image with an object HYg7B
37. Handedness and brain asymmetry are strictly human traits, as is shown in NW Pd~l+
________. a3(f\MMxE
A. the brains of chimps and perhaps other primates W@FGU
B. the fact that the great brain reorganization allowed our ancestor to use tools QOF'SEq"k
C. the fact that human beings alone can use tools, speak and think rationally ve=
nh]N
D. the two brain hemispheres of chimps and baboons d _koF-7
38. According to the text, a smart brain has all the following characteristics Qp>Q-+e0
EXCEPT _________. s-xby~
A. with different processing style T}A{Xu*:+H
B. with shared mental faculty ymyk.#Z<%
C. each side contributing in a complementary V{kgDpB
D. grasping the foreground and the background of the moment CB?H`R pC.
39. What is the problem of the people who suffer right-brain strokes? G{oM2`c'#8
A. They can hardly understand the literal meaning of sentences. \R<OT%8
B. Their left brain can still decode the words. <8/lHQ^\)
C. They do not understand the common proverb “a stitch in time saves nine”. fBt7#Tc=U
D. They cannot grasp the meaning of jokes or allusions. n
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40. The best title for the text may be __________. n?A;'\cK
A. Left Brain, Right Brain R0mWVg
oz
B. The Local of Global Image uM~j
C. Human Brain and Animal Brain D$c4's`5
D. The Smart Brain h9J
Questions 41 to 45 are based on the following passage. RpY#_\^hI
(此文不全) Ok~\
The Du Pont Company, the 13th largest employer in the U.S., routinely gives c^8y/wfok
pre-employment blood tests to all blacks who apply for jobs to determine who might Bhrp"l
+|
be a carrier of the trait for sickle-cell anemia, even though the trait is regarded as v4Q8RE?
largely harmless. Although there are other genetically transmitted blood diseases and Au/n|15->C
metabolic disorders that predominate in racial or ethnic groups, blacks are the only x_5H_! \#
ones to be identified with a disease and examined for it at Du Pont. In a three month 5 ERycC y
study of genetic screening in the American lace, the New York Times found no WChJ
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other instance of an ethnic or racial group singled out in or company. w~g)Dz2G
Du Pont officials emphasize that the sickle trait tests do not represent discrimination 1jozM"H7Q
and are only an effort to help them avoid potentially harmful exposure to certain _\LAWQ|M4[
chemicals. Yet the officials can offer no firm evidence that the trait -- not the disease, X;0DQnAI8j
but only a single abnormal gene -- makes blacks more vulnerable. b
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Du Pont, which employs well over 100,000 workers, is in the vanguard of American Tce2]"^;
companies doing genetic screening and thus is at the center of the debate over this Dl%NVi+n
area of science, debate so intense, so broad, that even medical directors from other m.p{+_@M&
companies who believe possibilities of genetic screening want no part of it. At
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least, not now but officials at Du a leader in the chemical industry with annual dg1h<]T"9
gross sales of more than $ 10 billion, feel they have the money and the scientists to nV%1/e"5
turn the distrust into achievement. If some chemicals are highly toxic and the FXOA1VEg
workplace is less than pure, company officials reason, it is only logical to try to 8:,l+[\
determine why some workers get sicker faster and why others seem to have more i9oi}
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tolerance for industrial poisons. And so the company is looking beyond the skills and &la;Vu"dp
loyalty of its workers to ery genetic structure. DxT8;`I%
The sickle-cell trait is not the same as sickle-cell anemia. The anemia is rare but *#,wV
debilitating disorder found in fewer than 50,000 American blacks, about two-tenths of .4~n|d>z
a percent of the black population. Perhaps two million other blacks are carriers of F%x
8y
the trait -- they are heterozygous; that ing a gene for sickle-cell W9?Vh{w
anemia from one parent. Virtually all the carriers can lead very active lives and show ^~2GhveBV
no symptoms of the disease. Y`3>i,S6\
41. What does the author say about Du Pont? ucyz>TL0
A. It examined the blood of some blacks QOkPliX
B. It examined some blacks for their knowledge of blood. [dL4u^]{
C. It discovered that some blacks have blood illness. q7C>A`w
D. It discovered the blood of some blacks containing industrial chemicals. 0I4RZ.2*Y
42. What do Du Pont officials say? !~cTe!T
A. They are trying to protect blacks form health threats. %J?;@ G)r
B. They can prove that blacks are likely to have health problems. -U(T
C. They regard the skills of workers as the most important matter. 7%9Sz5z
D. They hope that other companies can follow their example. Ym5q#f)|
43. What is true about genetic screening? jx&pRjP
A. It often aims at black employees. UfSWdR)
B. Its focus is often on sickle-cell anemia. XS]=sfN
C. Some companies do not want to do it. e7ixi^Q
D. The US government strongly supports it. )%U&z>^P
44. The underlined word “toxic” in the third paragraph probably means _____. Ujw A06
A. powerful. Ft>Abj,6
B. complex. veg\A+:'
C. thick. RZ9vQ\X
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D. poisonous. ](4V3w.
45. What can we learn about the carriers of sick-cell trait? pm,&