Unit21《Human Biology》(Lesson 1)ppt-北师大版高二下
Unit21《Human Biology》(Lesson 1)ppt-北师大版高二下第4页

 Look at the title of the magazine article and predict which issues may be covered in the article. Then read the article quickly and see if any of your guesses are right?

It is about whether chewing gum is good or bad for you.