3. When may a woman start her nevirapine-based treatment if she gets the single dose of nevirapine at delivery
A She may start nevirapine-based treatment soon after her delivery.
B She may start nevirapine-based treatment within six months after her delivery.
C She has to wait at least six months after that nevirapine exposure.
D She may wait several years so as to achieve the best effect.
4. We may learn from this passage that HIV resistance against nevirapine
A lasts only for about a half year and fades quickly.
B will last forever in a woman who took nevirapine.
C is a terrible drug that must be banned at once.
D is a problem too difficult to be solved.
5. Generally speaking， the authors attitude towards the use of nevirapine is
A negative
B positive
C uncertain
D doubtful
答案与题解：
1.D 第一段第一句及第二段第二句均提到nevirapine可以防止母亲在分娩时将HIV病毒传染给新生儿的问题，故D项是正确答案。
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。
3.C 第四段第二句说到，等待的时间最短可到六个月，第五段第一句又说，最少等待六个月的妇女，她们以nevirapine为主的药物综合治疗的疗效要比等待不足六个月的妇女高70%，可见C项“最少要等待六个月”是正确答案。
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。
5.B 第一段是文章的提要，最能说明作者观点，其中最后一句就明确提到，已经服用 nevirapine的已感染上HIV的母亲们不应该放弃服用这种能用得起的药物。而且通篇文章都在探讨如何更有效地利用此药物，因此作者对使用此药的态度应该是“积极的、肯定的”。