【Teaching goals】Enable the Ss to get some basic knowledge about HIV / AIDS.
【Important points】In what ways the HIV virus is spread and how to stay safe.
Step 1: Skimming reading:
1. What’s a virus? A virus is a very_______ _______ _______ _______ _______ ______. (导致疾病的微生物）
2. How does HIV affect people’s health?
