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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 n? =O@yq  
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        题目:Bird flu and the deteriorating environment   as y:[r"  
        范文 l :iQJ9Hdz  
        Earlier this year, bird flu panic was in full swing: The French +R{~%ZTK  
        feared for their foie gras, the Swiss locked their chickens indoors, _pvt,pW  
        and Americans enlisted prison inmates in Alaska to help spot qAlX#]  
        infected wild birds. ^)|tf\4  
       Y[rCF=ZVH  
        The H5N1 virus - previously confined to Southeast Asia - was N693eN!  
        striking birds in places as diverse as Germany, Egypt, and Nigeria, qM 3(OvCt  
        and a flu pandemic seemed inevitable.   sdd%u~4,X  
        m?4HVv  
        Then the virus went quiet. Except for a steady stream of human cases c3<H272\  
        in Indonesia, the current flu epicenter, the past year's worries ).Iifu|ks  
        about a catastrophic global outbreak largely disappeared. 8QI+O`  
        What happened?   o(D_ /]'8  
        'fzJw  
        Part of the explanation may be seasonal. Bird flu tends to be most 8LuU 2Lo  
        active in the colder months, as the virus survives longer at low *8u<?~9F  
        temperatures.   PBL=P+  
         91fZ r  
        "Many of us are holding our breath to see what happens in the {8%KO1xB  
        winter," said Dr. Malik Peiris, a microbiology professor at Hong 8`I,KkWg   
        Kong University. "H5N1 spread very rapidly last year," Peiris said. &,,:pL[  
        "So the question is, was that a one-off incident?" U:PtRSdn!b  
      G%}k_vi&q  
        Some experts suspect poultry vaccination has, paradoxically, wjOJn]  
        complicated detection. Vaccination reduces the amount of virus nVP|{M  
        circulating, but low levels of the virus may still be causing Fd%JF#Hk  
        outbreaks - without the obvious signs of dying birds.   H>-{.E1bG  
      kD((1v*D$  
        "It's now harder to spot what's happening with the flu in animals WK{F  
        and humans," said Dr. Angus Nicoll, influenza director at the br?pfs$U  
        European Centres for Disease Control and Prevention. 25W #mh,'  
      '@^mesMG  
        While the pandemic has not materialized, experts say it's too early JM*!(\Y  
        to relax.   Z:,`hW*A6  
      e%=SgXl2t  
        "We have a visible risk in front of us," said Dr. Keiji Fukuda, w,<n5dMv  
        coordinator of the World Health Organization's global influenza 6_;n bqY&  
        program. But although the virus could mutate into a pandemic strain, ~*tn|?%  
        Fukuda points out that it might go the other direction instead, !_iv~Q zv  
        becoming less dangerous for humans. &hM7y7  
      >``  
        H5N1 has primarily stalked Asia. This year, however, it crossed the *c(YlfeZ#  
        continental divide, infecting people in Turkey, Iraq, Egypt, *3fhVl=8^*  
        Djibouti, and Azerbaijan. j:HIcCp  
      8rLhOA  
        But despite the deaths of 154 people, and hundreds of millions of [z'jL'\4  
        birds worldwide dying or being slaughtered, the virus still has not n3\~H9  
        learned how to infect humans easily. srS)"Jt  
        |Rm_8n%m  
        Flu viruses constantly evolve, so the mere appearance of mutations 7GJcg7s*T  
        is not enough to raise alarm. The key is to identify which mutations xi)$t#K"  
        are the most worrisome. ?YF2Uc8z%2  
      K[Vj+qdyl  
        "We don't really know how many changes this virus has got to make to Ns\};j?TU*  
        adapt to humans, if it can at all," said Dr. Richard Webby, a bird tLP Er@  
        flu expert at St. Jude Children's Research Hospital in Tennessee. 8\+DSA  
      MIqH%W.r u  
        The most obvious sign that a pandemic may be under way will almost c^z) [  
        certainly come from the field: a sudden spike in cases suggesting 5eM{>qr}  
        human-to-human transmission. The last pandemic struck in 1968 - when ]VS:5kOj`  
        bird flu combined with a human strain and went on to kill 1 million PE?ICou  
        people worldwide.   y-~_W 6\  
        bicbCC6kC  
        In May, on Sumatra island in Indonesia, a cluster of eight cases was Fx:4d$>;  
        identified, six of whom died. The World Health Organization Fv:x>qZr@  
        immediately dispatched a team to investigate. D/wJF[_  
        The U.N. agency was concerned enough by the reports to put G[{Av5g mx  
        pharmaceuticals company Roche Holding AG on standby in case its :G &: v  
        global antiviral stockpile, promised to WHO for any operation to =JxEM7r  
        quash an emerging pandemic, needed to be rushed to Indonesia. 7t/Y5Qf  
      `$ vf9'\+  
        Luckily, the Sumatra cluster was confined to a single family. Though #oN}DP  
        human-to-human transmission occurred - as it has in a handful of }[(v(1j='~  
        other cases - the virus did not adapt enough to become easily /L./-92NH4  
        infectious. o[q|dhrANh  
        Oc5f8uv  
        This highlighted many of the problems that continue to plague public 0IBQE  
        health officials, namely, patchy surveillance systems and limited (i1p6  
        virus information. FRXaPod  
      ant2];0p  
        Even in China, where H5N1 has circulated the longest, surveillance l8e)|MSh  
        is not ideal. nQ{~D5y,,  
      ^)h&s*  
        "Monitoring the 14 billion birds in China, especially when most of i`?yi-R&  
        them are in back yards, is an enormous challenge," said Dr. Henk Iz>\qC}  
        Bekedam, WHO's top official in China. Of the 21 human cases China PH'n`D #  
        has logged so far, 20 were in areas without reported H5N1 outbreaks RLcC>Z  
        in birds.   ,$RXN8x1  
        N2lz {  
        "We need to start looking harder for where the virus is hiding," 2-@ t,T  
        Bekedam said.   }g:'K  
      p\Iy)Y2Lf!  
        To better understand the virus' activity, it would help to have more x'SIHV4M@Q  
        virus samples from every H5N1-affected country. But public health 5'%O]~  
        authorities are at the mercy of governments and academics. Dj6^|R$z&  
        Scientists may hoard viruses while waiting for academic papers to be 'pF$6 n;  
        published first. And developing countries may be wary of sharing jc@= b:r=  
        virus samples if the vaccines that might be developed from them 'z@]h m#  
        might ultimately be unaffordable. rd"!&i  
        B[2t.d;h  
        That leaves public health officials with an incomplete viral 2 #cw_Ua  
        picture. uLNOhgSUf  
      gADqIPu]  
        "It shouldn't just be WHO as a lonely voice in the desert, calling dF|R`Pa2ML  
        for more viruses (to be shared)," said Dr. Jeff Gilbert, a bird flu e-.(O8  
        expert with the Food and Agriculture Organization in Vietnam. All K7/&~;ZwT  
        countries, need to understand that sharing will help them better ;Rm';IW$  
        prepare for a flu pandemic, he said. 8: uh0  
      gV*4{ d`  
        Though scientists are bracing themselves for increased bird flu [g{fz3 O6  
        activity in the winter, there are no predictions about where it $XKUw"%  
        might appear next. The WHO's Fukuda said it would not be a surprise D%=&euB  
        to see it appear in new countries.
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29楼  发表于: 2007-10-10   
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