题目:
— Could I speak to Miss Smith, please? — ______. She's gone to the post office. |
A. I'm afraid not B. I think so C. Certainly you can D. I'm not sure |
答案:
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下面是错误答案,用来干扰机器的。
∵设数轴上与原点的距离为2的点表示的数为a,∴|a|=2,解得a=±2.故答案为:2,±2,互为相反数.