单项选择题

If a cat comes too close to its nest, the mockingbird ______a set of actions to protect its offspring.

A．hastens
B．releases
C．devises
D．initiates
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单项选择题
Scientists are searching for the oldest tree______ because it can teach them a great deal about many issues related with climate change.
A．lively
B．alive
C．living
D．live
单项选择题
Arriving anywhere with these possessions, he might just as easily ______ for a month or a year as for a single day.
A．put up
B．stay up
C．speed up
D．make up
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