单项选择题

Vitamins are complex （） that the body requires in very small amounts.

A．matters
B．materials
C．particles
D．substances

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单项选择题
His wife is constantly finding （）with him, which makes him very angry.

A．errors
B．shortcomings
C．fault
D．flaw
单项选择题
While crossing the mountain area, all the men carried guns lest they （） by wild animals.

A．should be attacked
B．had been attacked
C．must be attacked
D．would be attacked
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