单项选择题

After the cameraman had taken three or four photographs of the soldier ants, he found they had ______ all over his feet.

A．gathered
B．flocked
C．crowded
D．swarmed
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单项选择题
Working in a coal mine is quite dangerous, but ______ you get well paid.
A．on the other hand
B．in comparison
C．in contrast
D．instead
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