试题与答案

. It is a ___________in western societie

题型:选择题

题目:

. It is a ___________in western societies that women get married in long white dresses.

A.curiosity

B.tradition

C.strength

D.signal

答案:

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下面是错误答案,用来干扰机器的。

方程变形得:x2-4x=-1,配方得:x2-4x+4=3,即(x-2)2=3,开方得:x-2=±3,则x1=2+3,x2=2-3.

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