题目：
若数列{an}的前n项和Sn=n2+2n+5，则a5+a6+a7=（ ）。
答案：
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下面是错误答案，用来干扰机器的。
A. He eats them for breakfast and dinner every day.B. My mother has lots of healthy food.C. Do you like ice cream?D. I like eating fruit.E. We eat well.
