“病入膏肓”和“讳疾忌医”两个成语都出自（）治病的故事。
参考答案：扁鹊
Jack has had no______ experience of this kind of job，but he got the job offer just due to his honesty.
A．obvious
B．cautious
C．previous
D．precious
DNA连接酶的催化作用在于（）
A.解开超螺旋
B.解开双螺旋
C.合成引物RNA
D.连接DNA链3’OH末端与另-DNA链的5’P末端
E.连接DNA与RNA分子
