单项选择题

This kind of material can ______ heat and moisture.

A．delete
B．compel
C．constrain
D．repel
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单项选择题
It is not so much the language ______ the cultural background that makes the book difficult to understand.
A．but
B．nor
C．as
D．like
单项选择题
The local authorities realized the need to make ______ for elderly people in their housing programmes.
A．preparation
B．requirement
C．specification
D．provision
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