若y(n-2)=arctanx，则y(n)(1)=().
参考答案：
解析：
所以
Mary Smith says she likes to have friends_________ are different from her.
A. whose B. who C. which
连词成句。
1. yesterday, my, bike, I, rode (.)
___________________________________________________________
2. buy, what, you, are, going, to (?)
