单项选择题

During the long waiting, passengers had nothing to do but______ books and magazines.

A．thumb through
B．thumb over
C．thumbing through
D．thumbing over
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单项选择题
If you are always______ by uncertainty in doing anything, you'll come to nothing.
A．broken down
B．weighed down
C．turned down
D．pulled down
单项选择题
Some animals bred in zoos are being taken back to their natural habitat where their species may have______ or been endangered.
A．died away
B．died out
C．died off
D．died down
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