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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Finding a job can be______ and disappointing, and therefore it is very important that you are prepared.
A．exploiting
B．frustrating
C．profiting
D．misleading
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The existing government has been______ great importance to the improvement of the quality of education.
A．concentrating
B．attaching
C．focusing
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