第16题: [单项选择]The suggested causes of a given phenomenon cannot always be independently observed, and so it is hard to ______ the possibility of there being explanations alternative to the one proposed. A. account for B. rule out C. guard against D. do with 参考答案:B 答案解析:account for解释；guard against防备；do with可以用have/be to do with something“与某事有关”；上述三项，均与题义不符。rule out“排除…
第17题: [单项选择]下列方法中，能将HAV彻底杀灭的是（） A. 60℃4h B. 100℃5min C. 20%乙醚3min D. 70%乙醇3min E. 100℃3min 参考答案:B 答案解析:甲型肝炎病毒（HAV）具有耐酸、耐碱、耐乙醚的特点，对热也有一定的耐受性。要彻底杀灭甲型肝炎病毒（HAV）需要100℃5min，要灭活乙型肝炎病毒则需要100℃10min。
