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  3. Predicating the future is a risky business for a scientist. It is safe to say, that the global AIDs epidemic will get much wors

Predicating the future is a risky business for a scientist. It is safe to say, that the global AIDs epidemic will get much wors

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问题     Predicating the future is a risky business for a scientist. It is
safe to say, that the global AIDs epidemic will get much worse
before it gets any better. Sadly, this modern plague will be with us
for several generations, despite of major scientific advances.【S1】______
    As of January 2000, the AIDS epidemic had claimed 15
million lives and left 40 million people leaving with a viral infection【S2】______
that slowly but relentlessly erodes the immune system. Accounting
of more than 3 million deaths in the past year alone, the AIDs virus【S3】______
has become the deadly microbe in the world. In Africa nearly a【S4】______
dozen countries have a rate higher than 10% , including four
southern African nations which a quarter of the people are infected.【S5】______
This is like condemning 16,000 people each day to a slow and
miserable death.
    Unfortunately, the AIDs story has not been all gloom and【S6】______
doom. Less than two years after AIDs was recognized, the guilty
agent—human immunodeficiency virus, or HIV—identified. We【S7】______
now know more about HIV than about any other virus, but 14 AIDS【S8】______
drugs have been developed and licensed in the U. S. and western
Europe.
    The epidemic continues to rage, however, in south America,
Eastern Europe and sub-Saharan Africa. By the year 2025, AIDs
will have been by far the major killer of young Africans, decreasing
life expectant to as low as 40 years in some countries and single-【S9】______
handedly erasing the public health gains of the past 50 years.
    It is Asia, with its huge population at risk, where will have the【S10】______
biggest impact on the global spread of AIDS. The magnitude of the
incidence could range from 100 million to 1 billion, depending
largely on what happens in India and China.
【S5】
选项
答案which—where或∧which—in
解析 定语从句关系词误用。a quarter of the people are infected是定语从句，结构完整，由此推断先行词southern African nations在句中作地点状语，因此应该使用where或inwhich。
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