单项选择题

听下面5段对话或独白。每段对话或独白后有几个小题，从题中所给的A、B、C三个选项中选出最佳选项，并标在试卷的相应位置。听每段对话或独白前，你将有5秒钟的时间阅读各个小题；听完后，各小题将给出5秒钟的作答时间。每段对话或独白读两遍。 How often should the woman recharge the batteries

A． Every few days.
B． Every few weeks.
C． Every few months.
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单项选择题
How long can a brain keep alive without enough blood
A． Less than two minutes.
B． Not more than five minutes.
C． More than ten minutes.
单项选择题
A．walkedB．steppedC．liftedD．stood
A．walked
B．stepped
C．lifted
D．stood
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