Aims:

1. Ability aims: 1).To learn some useful words and expressions 2).To learn some useful structures 2. Knowledge aims: 1). Grasp the usage of such important expressions : as a result (of sth); long; turn around; suggest; powerful; control; go down; look up. 2).Master the sentence pattern: as引导的状语从句 no… no… protect … from …保护……免受……（危害）