题目内容

卧推过程中不要把、和臀部拱起或憋气,这样会使肌肉失去控制,是危险的。

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About60percentofthestudents_____fromthesouth,therestofthem_____fromthenorthandforeigncountries

A. are: is
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C. is:are
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Halfoftheworkershere_____under30_____.

A. is:years
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Theaudience_____solargethatnoseatwasleftunoccupiedinthegreathall

A. is
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A. arespeaking
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