Knowledge and skills
1．To enable the students to know something about what is HIV/AIDS，how it is contacted and how to protect oneself from getting the disease.
2．To get the students to learn the following useful new words and structures：judgment(看法；判决；判断)，awkward(局促不安的；笨拙的)，It is/was...that/who...，be likely to.
3．To help the students learn how to write a letter giving advice.
