选出与所给单词同类的选项。( ) 1. teach ( ) 2. ice ( )

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问题选择题

选出与所给单词同类的选项。

( ) 1. teach
( ) 2. ice
( ) 3. walking
( ) 4. she
( ) 5. asks

A. English
A. stand
A. sing
A. he
A. backwards

B. skating
B. snow
B. king
B. him
B. talk

C. learn
C. think
C. saying
C. his
C. says

答案

1. C 2. B 3. C 4. A 5. C

解答题

已知数列{a_n}的前n项和为S_n，满足S_n=2a_n-n

（1）求数列{a_n}的通项公式；

（2）设b_n=（2n+1）（a_n+1），求数列{b_n}的前n项和T_n．

单项选择题

No one can avoid______by advertisements.

A．being influenced

B．influencing

C．having influenced

D．to be influenced