在等差数列{an}中,若a2+a8=4,则其前9项的和S9=( )
He won the match because he took the advantage of his height.
实验是化学学习的一种重要手段,如利用电解水实验可探究水的组成。请根据电解水实验回答下列问题:
I enjoy____ photos,so I____ the school Photography Club.