单项选择题

Polar explorers have to be extremely ______ to endure the abominable climate and other hardships.

A．rough
B．hard
C．tough
D．cautious
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单项选择题
To give praise ______ the giver nothing but a moment's thought and a moment's effort.
A．costs
B．tells
C．benefits
D．prizes
单项选择题
The newcomer was ______ admittance to the classroom for not being properly dressed.
A．rejected
B．denied
C．opposed
D．refused
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