单项选择题

Which of the following is TRUE about ground water

A．It comes from the oceans.
B．It depends on seasonal rain.
C．It is 95% of all water.
D．It collects under the eart
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单项选择题
Where would this advisory most likely appear
A．In a newspaper.
B．In an embassy pamphlet.
C．In an airline in-flight magazine.
D．In a travel guidebook.
单项选择题
This passage mainly discusses______.
A．water conservation
B．the hydrologic cycle
C．underground water
D．polluted ground water
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