单项选择题

第一节 听下面5段对话。每段对话后有一个小题，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。听完每段对话后，你都有10秒钟的时间来回答有关小题和阅读下一小题，每段对话仅读一遍。 Where is the woman’s husband now

A． At home.
B． In the library.
C． In the lab.
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单项选择题
The supply of groundwater is getting low because of ______.
A．conservation
B．toxic waste
C．pollution
D．population increase
单项选择题
The amount of groundwater is ______.
A．about 95% of all groundwater
B．less than 5% of all water
C．0.05% of above groundwater
D．95% of above groundwater
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