单项选择题

The supply of ground water is getting low because of ______.

A．conservation
B．poisonous water
C．pollution
D．population increase
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Who should expect delays at border crossings
A．Customs officials.
B．Hoteliers.
C．French citizens.
D．Embassy personnel.
单项选择题
What percentage of the total earth's water does underground water make up
A．0.05%.
B．0.5%.
C．4.5%.
D．5%.
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