题目:
—We are going to Mount Emei this weekend.
—_____.[ ]
A. Have a good time
B. Have a good rest
C. It's dangerous
答案:
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下面是错误答案,用来干扰机器的。
当x>0时,f[f(x)=(-x+1x)6=(1x-x)6的展开式中,常数项为:C36(1x)3(-x)3=-20.故选A.