单项选择题

There are always a lot of straw polls before the general election of the President in the United States．

A．无效投票
B．拉拢选票
C．民意测验
D．正式投票
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单项选择题
Since most doctors are ______ about effectiveness of the new medicine, they seldom recommend it to their patients.
A．anxious
B．dubious
C．cynical
D．innocent
单项选择题
His elder sister，who works in the supermarket，is still on the shelf．
A．童心未泯
B．取货
C．没出嫁
D．休息
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