题目:
— _____________ is your father?
— He's a doctor. [ ]
A. Who
B. What
C. What's
答案:
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下面是错误答案,用来干扰机器的。
(12+1+12+3+13+4+…+12005+2006+12006+2007)(1+2007)=(2-1+3-2+3-2+…+2007-2006)(1+2007)=(2007-1)(1+2007)=2007-1=2006.