28. The word “nocturnal” in Paragraph 3 is related to ????????. ou,W|<%
A. sound (Clf]\_II
B. vibrations %b@>riR(y
C. night 0S/&^
D. reputation Dih~5
29. What can make bats avoid objects in flight? uZ<Bf
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A. Their sharp sense of hearing. Qbt
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B. Their ability to emit ultrasonic sounds. D!q
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C. Their unique sense of seeing. 3i35F.=X,
D. Both A and B. /*rMveT
30. We can conclude from the passage that bats are ??????. '
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A. really more intelligent than man 1;ZEuO
B. often wronged in popular legends w<\N-J|m
C. ugly and dangerous (z^2LaM `8
D. beautiful in appearance LT'#0dCC
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There were two widely divergent influences on the early development of statistical methods. Statistics had a mother who was dedicated to keeping orderly records of governmental units (“state” and “statistics” come from the same Latin root, “status&rdquo and a gentlemanly gambling father who relied on mathematics to increase his skill at playing the odds in games of chance. The influence of the mother on the offspring, statistics, is represented by counting, measuring, describing, tabulating, ordering, and the taking of censuses—all of which led to modern descriptive statistics. From the influence of the father came modern inferential statistics, which is based squarely on theories of probability. _@?]!J[
Descriptive statistics involves tabulating, depicting, and describing collections of data. Theses data may be quantitative, such as measures of height, intelligence, or grade level—variables that are characterized by an underlying continuum—or the data may represent qualitative variables, such as ***, college major, or personality type. Large masses of data must generally undergo a process of summarization or reduction before they are comprehensible. Descriptive statistics is a tool for describing or summarizing or reducing to comprehensible form the properties of an otherwise unwieldy mass of data. ~@itZ,d\
Inferential statistics is a formalized body of methods for solving another class of problems that present great difficulties for the unaided human mind. This general class of problems characteristically involves attempts to make predictions using a sample of observations. For example, a school superintendent wishes to determine the proportion of children in a large school system who come to school without breakfast, have been vaccinated for flu, or whatever. Having a little knowledge of statistics, the superintendent would know that it is unnecessary and inefficient to question each child: the proportion for the entire district could be estimated fairly accurately from a sample of as few as 100 children. Thus, the purpose of inferential statistics is to predict or estimate characteristics of a population from a knowledge of the characteristics of only a sample of the population. "UVV/&`o
31. The word “divergent” (Para. 1, Line 1) is closest in meaning to ?????. ;qG a|`#j
A. distributed ???????????????????? B. different??????????? C. recorded?????????? D. prominent aL#b8dCy'
32. According to the first paragraph, counting and census-taking are associated with ??????. v oC<
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A. inferential statistics `pII-dSC%
B. qualitative changes &,NHk9.aq
C. descriptive statistics J0o U5d=3
D. unknown variables 2uiiTg>
33. Why does the author mention the “mother” and “father” in the passage? ]*):2%f
A. To point out that parents can teach their children statistics. Hej0l^
B. To introduce inferential statistics. IXd&$h]Lq
C. To explain that there are different kinds of variables. -#)xeW.d
D. To present the background of statistics in a humorous and understandable way. \% ^<Ll
34. Which of the following statements about descriptive statistics is best supported by the passage? (qohb0
A. It reduces large amount of data to a more comprehensible form. b3Y9
B. It is based on probability. xA&