第2题: [填空题]S10 参考答案:Using a tape recorder helps you concentrate on what your subject is saying. 答案解析:Main Points:The use of a tape recorder is very help for you to focus on your subject.
第32题: [填空题]The Manna Kea Astronomy standing on the top of the world’s highest island mountain serves as one of tile best observing points for space exploration. But the balance between science and culture re mains a big question to be solved.
第34题: [单项选择]引起非整倍体和多倍体改变的致突变物是()。 A. 烷化剂 B. 9-氨基吖啶 C. 氮芥 D. 硫芥 E. 秋水仙素 参考答案:E 答案解析:考查引起不同致突变作用机制的有代表性的化学物:烷化剂引起碱基错配;9-氨基吖啶是平面大分子嵌入DNA链;氮芥和硫芥引起碱基错配,只有秋水仙素能引起非整倍体和多倍体改变。