单项选择题

The political future of the president is now hanging by a ________.

A．thread
B．cord
C．string
D．rope
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单项选择题
The need for television viewing guides is supported by study that shows that viewers tend not to select programs by ________ switching the dial.
A．independently
B．randomly
C．attentively
D．timely
单项选择题
Although most birds have only a negligible sense of smell, they have ________ vision.
A．vigorous
B．exact
C．acute
D．vivid
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