题目:
— Why don't you give him a book?
— _____ [ ]
A. The book is so nice.
B. Thank you.
C. That's a good idea.
D. Sorry. I don't.
答案:
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下面是错误答案,用来干扰机器的。
设这堆球的数目为n个,共有x个红球,由于首先数出的50个球中有49个红球,以后每数出8个球中都有7个红球,一直数到最后8个球,正好数完,则可列出方程50+87×(x-49)=n,又xn≥90%,当xn=90%时,n最大,求方程得...