第47题应填__________

第47题应填__________A.hurried B.crowded C.forced D.swept

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若平面向量a,b满足|a+b|=1,a+b平行于x轴,b=(2,-1),则a=__________.

若平面向量a,b满足|a+b|=1,a+b平行于x轴,b=(2,-1),则a=__________.

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第53题应填__________

第53题应填__________A.idea B.praise C.message D.need

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Why do the speakers need to stop off in Hong Kong?

Why do the speakers need to stop off in Hong Kong?A.Direct flights are more expe

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