第7题: [单项选择]酶的化学本质是 A. 多糖 B. 脂类 C. 蛋白质 D. 氨基酸 参考答案:C
第8题: [单项选择]医院感染流行是指 A. 某医院、某科室医院感染发病率显著超过历年散发发病率水平 B. 某医院、某科室医院感染发病率超过历年散发发病率水平 C. 某医院、某科室医院感染发病率显著超过散发发病率水平 D. 某医院、某科室医院感染发病率高于历年散发发病率水平 E. 某医院、某科室医院感染发病率与历年散发发病率水平相当 参考答案:A
第11题: [单项选择]--What has happened --I got injured in a car accident. --I suppose you ______ too fast. A. were driving B. had driven C. had been driving D. have driven 参考答案:A 答案解析:根据上下文语境,我猜你那时“正在”开快车吧。此题易选[B]项,过去完成时强调的是在过去某个动作或时间之前已经发生或完成了的动作,不符合逻辑。
第13题: [单项选择]Whatever his former conduct ______ , his circumstance should exempt him from rebuke now.. A. may have been B. can be C. had have been D. could have been 参考答案:A 答案解析:虚拟语气题。“情态动词+完成时”表示对过去的事情做结论、推测、判断。这里表示作结论。这句话从句是过去时,主句表示现在,也就是我们所说的错综时态虚拟,所以选项[B)和[C]不合语法。选项[A]和[D]合