1．[句型展示]　There are three main classes of drugs, each_of_which has a different effect on the body.

　　毒品有三大种类，每一种对身体的影响都各不相同。

　　[典例背诵]　I have three foreign teachers, two of whom are from Canada.

　　我有三个外籍老师，其中两个来自加拿大。

　　2．[句型展示]　While in the beginning some people may even enjoy abusing drugs, in the end drug users find_themselves_trapped in a prison from which they cannot escape.

　　尽管最初一些人甚至喜欢滥用毒品，但是最终他们发现自己深陷泥潭而不能自拔。

　　[典例背诵]　Well, towards nightfall I found myself carried out to sea by a strong wind.

　　嗯，夜晚来临的时候，我发现自己被一阵强风刮进了海里。

　　1. reaction n．生理反应，副作用；回应，反应

　　[教材原句]　Although these drugs can produce different reactions, they can all make people addicted.

　　虽然这些毒品会产生不同的反应，但它们都使人们上瘾。

　　①He suffered a violent reaction to the medicine.

　　他对这种药物有强烈的不良反应。

　　(1)reaction to　　　　　 对......的反应

　　(2)react vi. 反应，回应

　　react to sth. 对......作出反应/回应

　　react with 与......起化学反应

　　react against 反对；反抗

　　react on/upon 影响；对......起作用

　　②Does he react to the sounds around him?

　　他对周围的声音有反应吗？

　　③Children tend to react against their parents by going against their wishes.

　　孩子们通常以违背父母的意愿来反抗他们。

[即境活用1]　用适当的介词填空