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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 V:?exJg9  
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        题目:Bird flu and the deteriorating environment   Y`@:L'j  
        范文 l >;Er[Rywr  
        Earlier this year, bird flu panic was in full swing: The French >"qnuv G  
        feared for their foie gras, the Swiss locked their chickens indoors, *QAcp` ;*  
        and Americans enlisted prison inmates in Alaska to help spot hS) X`M  
        infected wild birds. %u"3&kOV  
       ` <+MR6M  
        The H5N1 virus - previously confined to Southeast Asia - was 3DH} YAUU  
        striking birds in places as diverse as Germany, Egypt, and Nigeria, _hgu:  
        and a flu pandemic seemed inevitable.   h$`P|#V&  
        ?LU]O\p  
        Then the virus went quiet. Except for a steady stream of human cases W0GDn  
        in Indonesia, the current flu epicenter, the past year's worries Q/EHvb]  
        about a catastrophic global outbreak largely disappeared. m44Ab6gpsb  
        What happened?   P@ Oq'y[  
        2l5>>yY  
        Part of the explanation may be seasonal. Bird flu tends to be most E<u6 js,  
        active in the colder months, as the virus survives longer at low `Paz   
        temperatures.   4+fWIY1 "  
        &)4#0L4  
        "Many of us are holding our breath to see what happens in the NRU&GCVwu  
        winter," said Dr. Malik Peiris, a microbiology professor at Hong cE3g7(a  
        Kong University. "H5N1 spread very rapidly last year," Peiris said. L4bx [  
        "So the question is, was that a one-off incident?" i7hWBd4wK  
      N#(p_7M  
        Some experts suspect poultry vaccination has, paradoxically, Z(F`M;1>xI  
        complicated detection. Vaccination reduces the amount of virus @LQe[`  
        circulating, but low levels of the virus may still be causing 6_`9 4+  
        outbreaks - without the obvious signs of dying birds.   C"`,?K(U  
      M^f+R'Q3  
        "It's now harder to spot what's happening with the flu in animals l42 3+vo  
        and humans," said Dr. Angus Nicoll, influenza director at the ~?l>QP|o  
        European Centres for Disease Control and Prevention. ''Lf6S`4X~  
      |$AoI  
        While the pandemic has not materialized, experts say it's too early "UUzLa_  
        to relax.   9|y?jb5im  
      3zdm-5R.b  
        "We have a visible risk in front of us," said Dr. Keiji Fukuda, 5 ,H,OZ}  
        coordinator of the World Health Organization's global influenza {<f |h)r  
        program. But although the virus could mutate into a pandemic strain, *qM)[XO  
        Fukuda points out that it might go the other direction instead, ZdcG6IG+  
        becoming less dangerous for humans. }:6$5/?  
      rd#O ]   
        H5N1 has primarily stalked Asia. This year, however, it crossed the }q-*Ls ~  
        continental divide, infecting people in Turkey, Iraq, Egypt, t@hE}R  
        Djibouti, and Azerbaijan. Cp[{| U-?G  
      9c `Vrlu  
        But despite the deaths of 154 people, and hundreds of millions of H_ecb;|mP  
        birds worldwide dying or being slaughtered, the virus still has not st91r V$y?  
        learned how to infect humans easily. aaa6R|>0  
        o \r6 iO  
        Flu viruses constantly evolve, so the mere appearance of mutations S.i CkX  
        is not enough to raise alarm. The key is to identify which mutations [PRQa[_  
        are the most worrisome. i L vzoQ  
      KG8:F].u(  
        "We don't really know how many changes this virus has got to make to ^seb8o7  
        adapt to humans, if it can at all," said Dr. Richard Webby, a bird Ms * `w5n  
        flu expert at St. Jude Children's Research Hospital in Tennessee. ;s$bVGHr  
      @d/Wa=K  
        The most obvious sign that a pandemic may be under way will almost iS/faXe5  
        certainly come from the field: a sudden spike in cases suggesting cV|u]ce%1  
        human-to-human transmission. The last pandemic struck in 1968 - when ,)u7PMs  
        bird flu combined with a human strain and went on to kill 1 million Uo D@ix&0  
        people worldwide.   Uu}a! V  
        n#\ t_/\  
        In May, on Sumatra island in Indonesia, a cluster of eight cases was T?!D?YV  
        identified, six of whom died. The World Health Organization PF6w'T 5  
        immediately dispatched a team to investigate. MPS{MGVjbJ  
        The U.N. agency was concerned enough by the reports to put 0q4E^}iR  
        pharmaceuticals company Roche Holding AG on standby in case its \R}`S`fIw`  
        global antiviral stockpile, promised to WHO for any operation to 1kDr;.m%  
        quash an emerging pandemic, needed to be rushed to Indonesia. /a 'cP  
      H0 %;t  
        Luckily, the Sumatra cluster was confined to a single family. Though ]CL9N  
        human-to-human transmission occurred - as it has in a handful of )^D:VY9 2  
        other cases - the virus did not adapt enough to become easily jdEqa$CXG  
        infectious. ~ "IjT'W 3  
        P.j0Xlof  
        This highlighted many of the problems that continue to plague public 0/g 0=dW=  
        health officials, namely, patchy surveillance systems and limited :t'*fHi~  
        virus information. @An "ClDa  
      MT?;9ZV}  
        Even in China, where H5N1 has circulated the longest, surveillance ophQdJM  
        is not ideal. |IgH0 zZ  
      yn;sd+:z  
        "Monitoring the 14 billion birds in China, especially when most of ~"t33U6  
        them are in back yards, is an enormous challenge," said Dr. Henk (:TZ~"VY  
        Bekedam, WHO's top official in China. Of the 21 human cases China }2X"  
        has logged so far, 20 were in areas without reported H5N1 outbreaks >&`S$1 o  
        in birds.   p2\mPFxEP  
         !K0:0:  
        "We need to start looking harder for where the virus is hiding," tt%lDr1 A)  
        Bekedam said.   EAE\'9T&g  
      ]-7$wVQ<  
        To better understand the virus' activity, it would help to have more tsqkV7?  
        virus samples from every H5N1-affected country. But public health 2y"|l  
        authorities are at the mercy of governments and academics. $ M8ZF(W  
        Scientists may hoard viruses while waiting for academic papers to be W  :qQ  
        published first. And developing countries may be wary of sharing \A ?B{*  
        virus samples if the vaccines that might be developed from them j1sZRl)D  
        might ultimately be unaffordable. u5LrZ t]k  
        %~$P.Zh  
        That leaves public health officials with an incomplete viral i!U,q V1  
        picture. q7!$-  
      GCEcg&s=\S  
        "It shouldn't just be WHO as a lonely voice in the desert, calling a7_&;  
        for more viruses (to be shared)," said Dr. Jeff Gilbert, a bird flu bV~z}V&  
        expert with the Food and Agriculture Organization in Vietnam. All B,f4<  
        countries, need to understand that sharing will help them better l^ Q-KUI  
        prepare for a flu pandemic, he said.  Q9!T@  
      y!,Ly_x$@  
        Though scientists are bracing themselves for increased bird flu tzKIi_2  
        activity in the winter, there are no predictions about where it K< ;I*cA X  
        might appear next. The WHO's Fukuda said it would not be a surprise |v[0(  
        to see it appear in new countries.
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29楼  发表于: 2007-10-10   
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