题目内容

The man_________there is my brother.

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

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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

材料的开口孔隙率越多，则其（）。

A. 耐水性越好
B. 吸水性越差
C. 抗渗性越好
D. 抗渗性越差