单项选择题

Clouds are formed from ______.

A．water vapor
B．evaporation
C．the hydrologic cycle
D．groundwater
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单项选择题
According to the author, the importance of greenspaces in the urban environment ______.
A．is still unknown
B．is being closely studied
C．is usually neglected
D．has been fully recognized
单项选择题
The author suggests that the recreative possibilities of greenspace should be provided ______.
A．in special areas
B．in the suburbs
C．in the neighborhood of the house
D．in gardens and parks
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