题目

Students who pass the test will be  ______to the next grade, as has been announced. A. possessed        B. promoted      C. proposed        D. allowed 答案：B2．已知正项等比数列{an}前n项和为Sn，且满足S3=$\frac{7}{2}$，a6，3a5，a7成等差数列．（1）求数列{an}的通项公式；（2）求log2a1+log2a3+log2a5+…+log2a25的值．（3）设bn=an+log2an，求数列{bn}的前n项和Tn．