题目内容

The siren also reaches its top and then suddenly goes off.What's the meaning of the underlined part?

A. stop, discontinue
B. leave

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There is absolute dead _________ for a long moment.

A. silent
B. silence

The previously __________ objects have now been identified as being satellites.

A. unidentified
B. unidentifying

There are no enemy missiles ___________.

A. approach
B. approaching

The state of emergency has officially been _________. We are in no danger.

A. called on
B. called off

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