单项选择题

The atmosphere _______ of certain gases mixed together in definite proportions.

A．consists
B．comprises
C．composes
D．constitutes
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单项选择题
In summer, many North Americans go to Europe by boat because they expect to have a delightful_______.
A．voyage
B．travel
C．tour
D．journey
单项选择题
Cultural _______ indicates that human beings hand their languages down from one generation to another.
A．translation
B．transition
C．transmission
D．transaction
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