Step 1 Revision
Check the answers to the grammar exercises on Page 21 and explain the difficult ones.
Step 2 Lead－in by reading the following sentences
By the end of 2003，an estimated 42 million around the world were living with HIV/AIDS.
During the year,5 million people became infected and an est
imated 3 million people died.[来源:学&科&网]
About one－third of people living with HIV/AIDS are 15－24 years of age.More than 7 million people in Asia and the Pacific are living with HIV/AIDS.
Step 3 Pre－reading
It is likely that many students have incorrect information about the disease，so teachers should first get students to talk about something about HIV/AIDS by asking the following questions：Can ordinary people be at the risk of contracting HIV？In what way can people get infected？What measures can people take to protect themselves？Will people die if they have HIV?
