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Data Sufficiency
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题目:
In quadrilateral ABCD, is angle BCD a right angle?
(1) Angle ABC is a right angle.
(2) Angle ADC is a right angle.
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答案:
E
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画图之后显示四边形两个对顶角是90度,其他角只能是90选了C. 不明白为什么是E,求老师解答
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分析是:对顶角都是90度,这个四边形就应该是个长方形吧,所以选了c,请教老师。
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