单项选择题

We have got to abide by the rules.

A．stick to
B．persist in
C．safeguard
D．apply
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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
单项选择题
Philip Roth was hailed as a major new author in 1960.
A．published
B．challenged
C．acclaimed
D．guided
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