单项选择题

The use of the chemical may present a certain hazard to the laboratory workers.()

A. protection
B. indication
C. immunity
D. danger

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单项选择题
Successful leaders dominate events rather than react to them().

A. control
B. contribute
C. convey
D. contact
单项选择题
His motive in coming was to find out the truth.()

A. reasons
B. arguments
C. targets
D. stimuli
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