— Yes. He used to ________ the guitar, but now he is more _______ in playing soccer.
已知数列{an}满足a1=2,an+1-an+1=0n∈N*,则此数列的通项an等于( )
张先生参加了社区组织的“微心愿活动”,向某校捐赠了一批书籍。他对财产行使了( )