单项选择题

The word "stamp" (Para 2, Line 1) probably means ______.

A．to step with force
B．to mark by pressing
C．to stick a stamp onto
D．to put into a class or type
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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 earth.
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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