单项选择题

The signals that will be used for emergency should be clearly （）.

A. set out
B. set off
C. get off
D. cut off

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单项选择题
The fire drill is （）. You are dismissed.

A.finish
B.finished
C.begin
D.beginning
单项选择题
Lower the （）ladder.

A.embark
B.embarkation
C.disembark
D.B+C
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