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
William Penn planned Philadelphia as the holy city , carefully ________ so that each house would have the appearance of a country cottage.
A．laid out
B．laid down
C．laid by
D．laid on
单项选择题
If the fire alarm is sounded, all residents are requested to ________ in the courtyard.
A．assemble
B．coverage
C．crowd
D．accumulate
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