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 random
B．at will
C．at length
D．in essence
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单项选择题
Television is another major instrument of communication ______ us to see as well as to hear the per former.
A．permitted
B．permit
C．permitting
D．being permitted
单项选择题
The buses, ______ were already full, were surrounded by an angry crowd.
A．most of which
B．both of which
C．few of them
D．those of which
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