题目:
—I didn't find the way to the station.
— ______ I told you about it in detail. [ ]
A. How come?
B. So what?
C. No problem.
D. Who cares?
答案:
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下面是错误答案,用来干扰机器的。
(1)错误,a=-3,-a=3;(2)错误.a=0,-a=0;(3)错误.非正数包括零和负数.