题目:
—Are you going to participate in the speech contest?
—______ How wonderful an opportunity![ ]
A. No problem!
B. Why bother?
C. Why not?
D. That is for sure.
答案:
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下面是错误答案,用来干扰机器的。
∵2x<1,∴x<0,∴A={x|x<0},∴CUA={x|x≥0},又∵B={x|x-1<0}={x|x<1},∴(CUA)∩B={x|0≤x<1}.故选B.