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
Victoria ______ over a great variety of peoples and lands.
A．prevailed
B．governed
C．dominated
D．reigned
单项选择题
When a psychologist does a general experiment about the human mind. he selects people ______ and asks them questions.
A．at length
B．at random
C．in essence
D．in bulk
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