设f（x）=a^x+b同时满足条件f（0）=2和对任意x∈R都有f（x+1）=2f（x）-1成立．

（1）求f（x）的解析式；

（2）设函数g（x）的定义域为[-2，2]，且在定义域内g（x）=f（x），且函数h（x）的图象与g（x）的图象关于直线y=x对称，求h（x）；

（3）求函数y=g（x）+h（x）的值域．

27．Many students were watching the story of the heroes from Changjiang University on TV, ________ moved to tears.

A．all of them

B．all of whom

C．all of that

D．all of which