单项选择题


A．have
B．prepare
C．make
D．perform
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单项选择题
What might have been discussed in the preceding paragraphs
A．The ocean.
B．The earth.
C．The rainfall.
D．The atmosphere.
单项选择题
Which of the following is TRUE according to the passage
A．The volume of the atmosphere is four times that of the world's oceans.
B．The water in the oceans is the main source of rain and snow on land areas.
C．The atmosphere is mainly composed of the vapor carried over land by air currents.
D．The earth can not support the water in the atmosphere if it falls down onto the earth suddenly.
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