单项选择题

A．The density of the water droplets in the air.
B．The size of the water droplets.
C．The temperature of the water droplets.
D．The purity of the water vapor.
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单项选择题
The best definition of biosphere . as it is used in the text is.
A．the protective envelope formed by the atmosphere around the living earth
B．that part of the earth and its atmosphere in which life can exist
C．the living things on earth whose existence is made possible by circulation of the atmosphere
D．the circulation of the atmosphere’’s contribution to life on earth
单项选择题
The passage is most probably a part of______.
A．a story
B．a biography
C．an autobiography
D．a speech
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