summary
1.Learn some new phrases.need to do sth.需要做某事
stay away from sth.远离某物/某事say no to sth.对…说不
on the other hand另一方面lt's necessary for sb. to do sth.

3.Know how to keep healthy in ourdaily life.

Homework
1. Retell 1a.
2.Finish the exercises in theexercise book.