单项选择题

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

A．hastens
B．triggers
C．devises
D．releases
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单项选择题
The teacher told the students to stay in the classroom and they did ______.
A．absolutely
B．accidentally
C．accordingly
D．accurately
单项选择题
Last Sunday she came to visit us out of the blue. The italicized phrase means ______.
A．unexpectedly
B．unhappily
C．untidily
D．unofficially
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