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问题
填空题
已知无穷等比数列{a
n
}的前n项和S
n
的极限存在,且a
3
=4,S
5
-S
2
=7,则数列{a
n
}各项的和为( )。
答案
32
单项选择题
来源于瑞香科的药材是()
A.苏木
B.川木通
C.通草
D.大血藤
E.沉香
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选择题
Each of the students is going to have ______ examined before graduation.
A. he
B. him
C. himself
D. his
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