单项选择题

A．Catching runaway criminals.
B．Scratching the hidden bombs.
C．Patrolling the dangerous town.
D．Drug-sniffing and bomb-sniffing.
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单项选择题
If there is an infection, the first thing to do is to stop it before get the wisdom tooth removed.
A．Y
B．N
C．NG
单项选择题
According to the passage, the sentence But if the earth…for optimum comfort (in the 3rd paragraph) means
A．there is an unseen hand controlling the earth’’ s movement
B．there is an operating manual warning people against air-conditioning in the factory
C．people should prepare operating manuals to tell workers how to get greater comfort
D．people have been enjoying the most comfortable climate in Earth’’ s history.
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