练习:
A It is a broad-spectrum antibiotic and kills all kinds of bacteria.
C It prevents the transmission of the AIDS virus and protects one from heart attack.
2. Why does HIV resistance against nevirapine build very quickly even when the drug is used alone just once?
B Because there may not be a susceptibility test before using the drug.
D Because there are too many mutations of HIV for nevirapine to deal with.
A She may start nevirapine-based treatment soon after her delivery.
C She has to wait at least six months after that nevirapine exposure.
4. We may learn from this passage that HIV resistance against nevirapine
B will last forever in a woman who took nevirapine.
D is a problem too difficult to be solved.
A negative
C uncertain
答案与题解:
2.C 第三段第一句说,即使单独使用nevirapine一次,HIV病毒也会很快产生对nevirapine的抗药性,原因就是没有其他药物可以杀死nevirapine还没有杀死的病毒颗粒,这正是C项的内容。
4.A 第一段第三句说到抗药性存在的时间并不长,第四段第二句又说等待的时间可以短至六个月,另外,文章的标题也说抗药性很快消失,可见A项是正确选项,其他各项文章均未提及。
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