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本題由lindy提供
If x < 0, then √(?x)2 ? is
(A) -x
(B) -1
(C) 1
(D) x
(E) √x
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答案：
A
x小于0，那-
x就大于0，所以開根號出來應(yīng)該是一個大于0的數(shù)
那么bde就錯了
剩下a和c
c這個就太絕對了 不能等于2么
所以不科學(xué) 選A 
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