单项选择题

Because of its intimacy, radio is usually more than just a medium; it is ______.

A. firm
B. company
C. corporation
D. enterprise
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单项选择题
They were tired, but not any less enthusiastic （） that account．

A．on
B．by
C．for
D．with
单项选择题
Trees that ______ the view of the oncoming traffic should be cut down.
A. block
B. inhibit
C. spoil
D. alter
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