题目

 The moment Hans finished his driving test perfectly, he got out of the car__________, for this was the third time he had taken the test. A. in a hurry           B. in relief              C. in peace             D. in shock 答案：B“中心法则”揭示了生物体内遗传信息的传递和表达的过程。下列叙述正确的是A.生物的遗传信息都通过DNA复制传递给后代B.RNA病毒都需要通过逆转录来增殖后代C.RNA聚合酶与起始密码子结合启动转录D.tRNA和mRNA的结合场所在核糖体