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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单项选择题
The best title for this passage is ______.
A．Water Conservation
B．The Hydrologic Cycle
C．Underground Water
D．Polluted Groundwater
单项选择题
Clouds are formed from ______.
A．water vapor
B．evaporation
C．the hydrologic cycle
D．groundwater
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