第9题: [单项选择]Questions 32 to 35 are based on the passage you have just heard. A. People enjoy sport. B. There are general principles governing sport. C. Sport makes war less likely. D. Sport is enjoyed by common people. 参考答案:C 答案解析:[听力原文]32-35 (32)I am always amazed when I hear people saying that sport creates goodwill betw
第19题: [单项选择]听神经鞘瘤() A. 内听道扩大及早期耳聋、耳鸣 B. 咖啡样色素斑 C. 泌乳、闭经 D. 灌注压突破 E. 皮毛窦 参考答案:A
第20题: [单项选择]Because administering the whole company, he sometimes has to work around the clock.( ) A. adjusting B. evaluating C. engaging D. managing 参考答案:D
第33题: [单项选择]转录起始复合物是指()。 A. RNA聚合酶全酶-DNA-pppGpN′-OH B. RNA聚合酶核心酶-DNA-pppGpN′-OH C. RNA聚合酶全酶-DNA-引物-pppGpN′-OH D. RNA聚合酶核心酶-DNA-引物-pppGpN′-OH E. 亚基-DNA-pppGpN′-OH 参考答案:A 答案解析:转录起始不需要引物,在RNA聚合酶作用下直接催化NTP,按碱基配对原则以氢键结合于DNA模板上,在起始点上形成第一个磷酸二酯键。5′端通常为pppG或pppA。第二个核苷酸有游离的3′-OH,可以加入