题目

They are broadening the bridge to _______ the flow of traffic.(  ) A. put off     B. speed up     C. turn on     D. work out    答案:B  (1998•内江)能判定四边形是平行四边形的条件是( )A.一组对边平行,另一组对边相等B.一组对边相等,一组邻角相等C.一组对边平行,一组邻角相等D.一组对边平行,一组对角相等
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