第23题: [单项选择]利用实验动物目前还不可能做到的实验是() A. 进行病原菌的分离鉴定 B. 检测细菌的毒力 C. 制备免疫血清 D. 建立所有细菌人工感染的动物模型 E. 进行一些皮肤试验 参考答案:D
第24题: [单项选择]土地储备贷款抵押率为()。 A. 50% B. 60% C. 70% D. 80% 参考答案:C
第25题: [单项选择]At first, the speaker was referring to the problem of pollution in the country, but halfway in her speech, she suddenly ______ to another subject. A. committed B. switched C. favoured D. transferred 参考答案:B 答案解析:[考点] 词义辨析。
[解析] 本题测试动词辨异。A.commit犯(错误,罪行),干(坏事,傻事);B.switch转换或改变(话题,议题),意同change;C.favour喜爱,支持;有利于,
第34题: [单项选择]Questions 19 to 22 are based on the conversation you have just heard. A. A new fuel for buses. B. The causes of air pollution. C. Careers in environmental engineering. D. A way to improve fuel efficiency in buses. 参考答案:D 答案解析:[听力原文]19-22 M: Hi, Diana. Mind if I sit down W: Not at all, Jack. How have you been M: G