题目内容

在功能上，抑癌基因起负调控作用，而原癌基因起正调控作用

A. 对
B. 错

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HIV是逆转录病毒，其逆转录酶不具有3'→5'外切酶活性，因此没有校正功能

A. 对
B. 错

ex vivo途径易于操作，而且因为细胞扩增过程中对外源添加物质的大量稀释，不易产生副作用。同时，治疗中用的是人体细胞，尤其是自体细胞，安全性好，但不易形成规模，且必须有固定的临床基地。

A. 对
B. 错

Section ADirections:This section is to test your ability to give proper response.There are 5 recorded questionsin it.After each question,thereisa pause.The questions will readtwice.When you hear a question,you shoulddecide on the correctanswerfrom the4 choices markedA, B, C and D.Which one is the correct answer?

A. No, thanks.
B. Yes, please.
C. Not at all.
D. Yes, I want to buy a shirt.

Which one is the correct answer?

A. It’s 30 dollars.
B. It’ssize 10.
C. It’s blue.
D. It’s on the third floor.