题目内容

The students take a () test in March, and the main exam is in July.

A. previous
B. preliminary
C. preceded
D. elementary

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Agriculture must, therefore, ______ workers and savings to the new industrialized, urbanized sectors if a modern economy is to be achieved.

A. yield
B. succumb
C. subject
D. resort

病毒的致病因素:（）

A. 内毒素
B. 外毒素
C. 荚膜
D. 以上都不是

Some people () in part the defeat of the revolution in France and Germany to the English diplomacy, do you agree

A. contributed
B. attributed
C. distributed
D. owned

The middle-aged woman has been ()_ with a serious illness for half a year; she is dying now.

A. laid down
B. laid off
C. laid up
D. laid in