单项选择题

The use of 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
Philip Roth was hailed as a major new author in 1960.
A．published
B．challenged
C．acclaimed
D．guided
单项选择题
The river widens considerably as it begins to turn east.
A．extends
B．stretches
C．broadens
D．traverses
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