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主题 : 2007年考博英语写作范文系列35篇
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20楼  发表于: 2007-07-26   
ding
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21楼  发表于: 2007-08-02   
不错,十分感谢!
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22楼  发表于: 2007-08-08   
你好,我是刚加入的,能把你的这份资料赠送我一份吗?我的邮箱huangzx@zscas.edu.cn,谢谢
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23楼  发表于: 2007-08-13   
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24楼  发表于: 2007-08-13   
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25楼  发表于: 2007-10-02   
????
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26楼  发表于: 2007-10-06   
谢谢
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27楼  发表于: 2007-10-07   
哇,楼主太有才啦,哈哈,谢谢!!~~
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28楼  发表于: 2007-10-09   
考博英语作文题 w]@H]>sHd  
pH9xyN[:a  
        题目:Bird flu and the deteriorating environment   1  b&<De  
        范文 l oMNt676  
        Earlier this year, bird flu panic was in full swing: The French Wg5<@=x!G  
        feared for their foie gras, the Swiss locked their chickens indoors, ?2(5 2?cJ  
        and Americans enlisted prison inmates in Alaska to help spot )k^y<lC2a  
        infected wild birds. |l-~,eRvi5  
       Sj'Iz #  
        The H5N1 virus - previously confined to Southeast Asia - was 2RbK##`vC  
        striking birds in places as diverse as Germany, Egypt, and Nigeria, Rs@> LA  
        and a flu pandemic seemed inevitable.   ""f'L,`{.  
        Wa5B ;X~  
        Then the virus went quiet. Except for a steady stream of human cases +dG3/vV  
        in Indonesia, the current flu epicenter, the past year's worries _|Uv7>}J^  
        about a catastrophic global outbreak largely disappeared. P @Jo[J<  
        What happened?   0SV<Pl^  
        %y{'p:   
        Part of the explanation may be seasonal. Bird flu tends to be most drQI@sPp  
        active in the colder months, as the virus survives longer at low Lcz`  
        temperatures.   J))U YJO  
        6}cN7wnm j  
        "Many of us are holding our breath to see what happens in the )61X,z  
        winter," said Dr. Malik Peiris, a microbiology professor at Hong ^~1Z"kAnT  
        Kong University. "H5N1 spread very rapidly last year," Peiris said. 7>V*gV?v  
        "So the question is, was that a one-off incident?" p:; `X!  
      *e25!#o1  
        Some experts suspect poultry vaccination has, paradoxically, b5S4C2Ynq  
        complicated detection. Vaccination reduces the amount of virus ffQm"s:P  
        circulating, but low levels of the virus may still be causing $DlO<  
        outbreaks - without the obvious signs of dying birds.   `F$lO2#k  
      udOdXz6K?  
        "It's now harder to spot what's happening with the flu in animals ES\=MO5a7  
        and humans," said Dr. Angus Nicoll, influenza director at the @R_ON"h  
        European Centres for Disease Control and Prevention. +a"f)4\  
      Jr=XVQ(F  
        While the pandemic has not materialized, experts say it's too early 7NRm\%^q  
        to relax.    u]OYu  
      5.LfN{gE)  
        "We have a visible risk in front of us," said Dr. Keiji Fukuda, R2A#2{+H  
        coordinator of the World Health Organization's global influenza {TZV^gT4  
        program. But although the virus could mutate into a pandemic strain, s o7. $]aV  
        Fukuda points out that it might go the other direction instead,  q+BG  
        becoming less dangerous for humans. ffMk.SqI  
      -wr_x<7  
        H5N1 has primarily stalked Asia. This year, however, it crossed the NX5$x/uz  
        continental divide, infecting people in Turkey, Iraq, Egypt, IgN^~ag`  
        Djibouti, and Azerbaijan. H*P[tyz$  
      q8!]x-5$6j  
        But despite the deaths of 154 people, and hundreds of millions of i<(~J4}b  
        birds worldwide dying or being slaughtered, the virus still has not c#f@v45  
        learned how to infect humans easily. CQPq5/@Y4  
        =!G{+& j  
        Flu viruses constantly evolve, so the mere appearance of mutations <Uc  
        is not enough to raise alarm. The key is to identify which mutations qLPuKIF  
        are the most worrisome. z+{xW7  
      kA> e*6  
        "We don't really know how many changes this virus has got to make to yp[,WZt  
        adapt to humans, if it can at all," said Dr. Richard Webby, a bird s\< @v7A  
        flu expert at St. Jude Children's Research Hospital in Tennessee. \XO'7bNu-  
      ?E<9H/  
        The most obvious sign that a pandemic may be under way will almost MxH |yo[  
        certainly come from the field: a sudden spike in cases suggesting 0cDP:EzR;  
        human-to-human transmission. The last pandemic struck in 1968 - when 8rjD1<  
        bird flu combined with a human strain and went on to kill 1 million U^eos;:s8  
        people worldwide.   ,"F0#5  
        JL>frS3M  
        In May, on Sumatra island in Indonesia, a cluster of eight cases was G{{M' 1  
        identified, six of whom died. The World Health Organization p I~;3T:!  
        immediately dispatched a team to investigate. J"Fp),  
        The U.N. agency was concerned enough by the reports to put >_\[C?8  
        pharmaceuticals company Roche Holding AG on standby in case its MMUlA$*t  
        global antiviral stockpile, promised to WHO for any operation to nW} s  
        quash an emerging pandemic, needed to be rushed to Indonesia. pTB7k3g  
      k]^ya?O]p  
        Luckily, the Sumatra cluster was confined to a single family. Though $4}G  
        human-to-human transmission occurred - as it has in a handful of cR uN;  
        other cases - the virus did not adapt enough to become easily yn"4qC#Z  
        infectious. ksCF"o /@V  
        jE wt1S V  
        This highlighted many of the problems that continue to plague public 74a@/'WbE  
        health officials, namely, patchy surveillance systems and limited 2Y<]X7Ch:  
        virus information. oH!O{pQK}  
      [q C0YM  
        Even in China, where H5N1 has circulated the longest, surveillance GKjtX?~1  
        is not ideal. aL`wz !  
      X:I2wJDs\  
        "Monitoring the 14 billion birds in China, especially when most of I{r*Y9  
        them are in back yards, is an enormous challenge," said Dr. Henk ZHa>8x;Mjl  
        Bekedam, WHO's top official in China. Of the 21 human cases China M0~%[nX  
        has logged so far, 20 were in areas without reported H5N1 outbreaks &oq 0XV.M^  
        in birds.   q5L^>"  
        H17I" 5N  
        "We need to start looking harder for where the virus is hiding," wpN3-D  
        Bekedam said.   _ilitwRN3  
      /PeT4hW}  
        To better understand the virus' activity, it would help to have more `}KxzD  
        virus samples from every H5N1-affected country. But public health '"\'<>Be  
        authorities are at the mercy of governments and academics. 11YJ W-V  
        Scientists may hoard viruses while waiting for academic papers to be [U8/nT  
        published first. And developing countries may be wary of sharing \~z$'3H`  
        virus samples if the vaccines that might be developed from them _@!vF,Wcf  
        might ultimately be unaffordable. Su"Z3gm5Kw  
        ,LN^Zx*  
        That leaves public health officials with an incomplete viral  \20} /&  
        picture. A8{ xZsH  
      MO0NNVVi%U  
        "It shouldn't just be WHO as a lonely voice in the desert, calling %" 7UYLX  
        for more viruses (to be shared)," said Dr. Jeff Gilbert, a bird flu )!\6 "{  
        expert with the Food and Agriculture Organization in Vietnam. All v-d"dC`  
        countries, need to understand that sharing will help them better 3 CjixXaA$  
        prepare for a flu pandemic, he said. _^#eO`4"  
      i79$D:PcLa  
        Though scientists are bracing themselves for increased bird flu 1xd6p  
        activity in the winter, there are no predictions about where it 1x;@BV  
        might appear next. The WHO's Fukuda said it would not be a surprise EI6kBRMo  
        to see it appear in new countries.
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29楼  发表于: 2007-10-10   
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