单项选择题

He writes on both sides of the sheet to ________ paper.
A、converse
B、convert
C、conserve
D、consent

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不定项选择

钛具有良好的导电、导热性性能。
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A．错误
B．正确

They keep their mouths shut and your request of [填空1] more information out of them has come to nothing.

答案： 1、squeezing