题目

Oh, I’m not feeling well in the stomach. I ________ so much fried chicken just now. A． shouldn’t eat                     B.  mustn’t have eaten    C .  shouldn’t have eaten               D.  mustn’t eat 答案：C已知数列{an}，{bn}满足bn=log2an，n∈N*，其中{bn}是等差数列，且a5•a16=12，则b1+b2+b3+…+b20=（　　） A、-10B、log210C、-5D、log25