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
Costs of doing so come cheap when measured against an overall advertising ______.
A．bail
B．brokerage
C．budget
D．bill
单项选择题
The timber rattlesnake is now on the endangered species list, and is extinct in two eastern states in which it once______.
A．thrived
B．swelled
C．prospered
D．flourished
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