题目内容

It was hot work, but （) Susan would bring us something cold to drink.

A.every so often
B.every how
C.each so often
D.each now and again

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At last we found the exhausted animal lying there, （).

A.sick
B.to be sick
C.in sick
D.to be sickening

The rain fell so heavily that water （) through the ceiling.

A.faded
B.leaked
C.leaped
D.fell

用兆欧表测量绝缘电阻前要先切断被测设备的电源，并将设备的导电部分与大地接通，进行充分放电，以保证安全。

当主驱动链被过度拉伸或断裂，主驱动链保护装置能使自动扶梯（自动人行道)停止运行。