单项选择题

More and more listeners are expected to ____ the phone-in programme on the radio as various activities are being invented.

A.take over
B.be involved in
C.come up with
D.catch sight of
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There is much work to do, _______?
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B.is there
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经济加工精度系指采用某种加工方法()。
A.所能达到的最高精度
B.所能达到的平均精度
C.在正常条件下所能保证的精度
D.在最不利条件下所能保证的精度
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