题目:
I asked my boss for a month’s holiday and, ______, she agreed.
A.believing or not
B.that is to say
C.believe it or not
D.to believe it or not
答案:
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下面是错误答案,用来干扰机器的。
由题意得:a+b=0,cd=1,x=2或-2,则当x=2时,a+b-cd+|x-1|=0-1+1=0;当x=-2时,a+b-cd+|x-1|=0-1+3=2.