题目内容

由缠绕不足的闭合环形DNA形成的超螺旋是()。

A. 左手负超螺旋
B. 右手负超螺旋
C. 左手正超螺旋
D. 右手正超螺旋

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Labor Market Decline The decline of the labor market is easy to misinterpret (interpret). There are many reasons for that. During the 1970s, large numbers of women and young adults ___（41）(bear) during the baby boom entered into the work force. That _（42）(result) in too many workers for the jobs available and depressed wages. The decline also has something to do with the explosive _（43）(grow) in world trade since 1960. As _（44）(manufacture) technologies have become more mobile, production jobs have _（45）(move) from the U.S. to countries where wages are low. In _（46）(add), technology itself has helped to cause the shifts in the job market. For example, _（47）(few)American workers are needed to make steel today than in the past, because new _（48）(machine) have made many of their tasks _（49）(necessary). Finally, the high rate of _（50）(employment)caused by these factors has tended to drive wages down further. _.
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某英文报社正在举办题为"My Hobby"的征文活动。请就此题目写一篇英文短文应征。内容包括以下两个方面： ①你的爱好是什么？ ②你为什么有这个爱好？

双链DNA之所以有高的解链温度是由于它含有较多的()。

A. 嘌呤
B. 嘧啶
C. A和T
D. C和G
E. A和C

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