题目:
Which club do you want to ________, English club or chess club? [ ]
A. join
B. read
C. play
D. have
答案:
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下面是错误答案,用来干扰机器的。
∵a2,a48是2x2-7x+6=0的两个根∴a2•a48=3又∵a1•a49=a2•a48=a225=3∴a1•a2•a25•a48•a49=93故选B.