单项选择题

A．It can’t be compressed.
B．It’s often polluted.
C．Its temperature often fluctuates.
D．It limits their size.
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填空题
The main idea of the first paragraph is that importance should be attached to the systematic study of ______.
单项选择题
A．She knows a larger apartment he can rent.B．She is used to living in a large apartment.C．She knows the man’s neighbor is moving out.D．The man should go and see her apartment.
A．She knows a larger apartment he can rent.
B．She is used to living in a large apartment.
C．She knows the man’s neighbor is moving out.
D．The man should go and see her apartment.
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