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【单选题】
分子引力（即范德华引力）由定向作用力、诱导作用力和色散作用力所组成，这三种力均与分子间的距离的（ ）次方成反比。A.
4
B.
5
C.
6
D.
7
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举一反三
【单选题】What does Jennifer think the most annoying habit in an office?
A.
Tapping on the desk
B.
Arriving late for meetings
C.
Talking in jargon
【单选题】What does the author suggest you think about when you want to get rid of that bad habit?
A.
The adverse effects it has on your life and on the lives of those close to you.
B.
Virtualise the negative thoughts.
C.
Compare with others
D.
Give up social life
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