题目内容

[A] until
[B] unless
[C] if
[D] though

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7．DNA在10nm纤丝中压缩多少倍？( )

A. 6倍 B．10倍 C．40倍 D．240倍 E．1000倍 F．10000倍

4．______键负责维持A-T间(或G-C间)的亲和力。

What's the main idea of the passage？
[A] Professional knowledge is a decisive factor in a job interview.
[B] Finding a job is more difficult than one can imagine.
[C] Self-confidence is most important for a job hunter.
[D] A job seeker should create a good image during an interview.

1．在高盐和低温条件下由DNA单链杂交形成的双螺旋表现出几乎完全的互补性，这一过程可看作是一个复性(退火)反应。