题目内容

They stood ______ while the man was robbed.

A. looked at
B. looking on
C. looked on
D. looking at

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The man_________there is my brother.

A. sit
B. be sit
C. sitting
D. seat

Librarians spend a lot of time ______ books.

A. classify
B. class
C. classifying
D. arrange

It is not ______ that Jim got fired — he was always daydreaming at work.

A. astonish
B. astonished
C. astonishing
D. astonishment

当材料的润湿角θ为（）时，称为憎水性材料。

A. 大于90º
B. 小于90º
C. 等于90º
D. 大于180º