第8题: [单项选择]I' m sure he is up to the job ______ he would give his mind to it. A. if only B. in case C. until D. unless 参考答案:A 答案解析:[考点] 词义辨析。 [解析] 本题测试连词辨析。A.if only只要;B.in case万一;C.until至到……为止;D.unless除非。
第9题: [单项选择]DNA复制时下列哪一种酶是不需要的?() A. DNA指导的DNA聚合酶 B. 连接酶 C. 解螺旋酶 D. RNA指导的DNA聚合酶 E. 拓扑异构酶 参考答案:D