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  3. Predicting the future is a risky business for a scientist. It is safe tosay

Predicting the future is a risky business for a scientist. It is safe tosay

游客2024-11-03  2
问题     Predicting the future is a risky business for a scientist. It is safe to
say, however, that the global AIDS epidemic will get much worse
before it gets any better. Sadly, this modem 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 that slowly【S2】________
but relentlessly erodes the immune system. Accounting of more than 3【S3】________
million deaths in the past year alone. the AIDS virus has become the
deadly microbe in the world. In Africa nearly a dozen countries have a【S4】________
rate higher than 10％。including four southern African nations which a【S5】________
quarter of the people are infected. 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 doom. 【S6】________
Less than two years after AIDS was recognized, the guilty agent—
human immunodeficiency virus, or HIV--identified. We now know【S7】________
more about HIV than about any other virus, but 14 AIDS drugs have【S8】________
been developed and licensed in the US 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-handedly【S9】________
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.  [br] 【S8】
选项
答案 but—and
解析 连词误用。此处上半句说“我们对人类免疫缺陷病毒的了解比对其他病毒的了解要多”，下半句说“在美国和西欧已经研制并审批了14种治疗艾滋病的药物”。二者构成递进关系，故应使用and。
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