Teaching Aims:
1. Learn the important language points
2. Enable the students to know some thing about American school system
复习： 1．instruction n．→_________ v． 2．encouragement n．→___________ v． ]
3．fluency n．→_______ adj. 4．disappear vi.→_______________ ．（反义词）]]
5．assistant n．→_________ v．→_______________ n．
