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  3. There is progress toward a possible treatment for lung diseases such as SARS(severe acute respiratory syndrome). Researchers ha

There is progress toward a possible treatment for lung diseases such as SARS(severe acute respiratory syndrome). Researchers ha

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问题     There is progress toward a possible treatment for lung diseases such as SARS(severe acute respiratory syndrome).  Researchers have learned more about how the SARS virus works: it【S1】______with a system in the body that uses enzymes(酶)to control blood pressure and fluid balance. Scientists say the virus【S2】______to an enzyme known as ACE-two. The virus blocks the enzyme, permitting fluid to enter the lungs.
    A team from Europe and Asia reported the【S3】______in Nature Medicine.  Doctor Josef Penninger of the Institute of Molecular Biotechnology in the Austrian Academy of Sciences was the【S4】______writer of the report. The discovery could lead to a new【S5】______of treating not just SARS but also other diseases that can cause lung failure. These include avian flu(禽流感)and influenza in humans.
    The first【S6】______of SARS were discovered in Guangdong province, in southern China, in November of 2002. SARS was not【S7】______as a worldwide threat until March of 2003. The disease spread to 26 countries, most of them in the Asia-Pacific area. An estimated 8, 000 people had SARS. More than 770 of them died, or about 10% , a【S8】______high rate.
    The World Health Organization warned people not to travel to【S9】______areas. The【S10】______hurt international travel and business.  The W. H. O. says the disease stopped spreading by July of 2003. As a result of SARS, the health agency got new powers to act before a government officially announces a crisis.

A)means                                            I)relatively
B)alternative                                      J)findings
C)attaches                                         K)optimistically
D)crisis                                           L)identified
E)cases                                            M)interferes
F)associates                                       N)distributed
G)major                                            O)affected
H)awful
【S7】
选项
答案L
解析 此处需要填入一个动词的过去分词或形容词，可选范围缩小到B、H、L、N和O；但是空白后有as a worldwide threat，alternative在逻辑上不合适，但是填入awful的话与后面的 until从句又相矛盾；distributed和affected不与as搭配，故可确定正确答案为L。
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