Unit 21 Warm-up & Lessons 1-2

　　请和你的同学一起认真分析下列句子，并补全所缺内容。这种学习方式能逐步提高你理解长难句的能力。

1. These drugs are originally developed to help people with illnesses, but in the wrong hands, they create supreme athletes making them faster and stronger than is normal for human beings. (P34)

【分析】本句是一个由but连接的并列句。but前的分句中，to help people with illnesses作目的状语；but后的分句中，making them faster and stronger than is normal for human beings为动词-ing形式短语作________，than在这里是连词，其后省略了主语it。

【句意】研制这些药物原本是用来帮助人们解除病痛的，但误用到运动员身上，就会使他们在竞技比赛中超乎寻常地发挥，变得更快、更强。

【仿写】发明因特网原本是为了给人们的日常生活带来便利，但是误用的话，就会使一些人变成网虫，对网络过分依赖。

The Internet ________ ________ ________ to bring convenience to people's daily lives, but in the wrong hands, it creates mouse potatoes, ________ ________ ________ ________ ________ the Internet than necessary.

2. Taking these drugs is known as "doping" and although they enhance performance, they also cause serious health problems in later life for those who abuse them. (P34)

【分析】本句是一个由and连接的并列复合句。and前的分句是一个简单句，Taking these drugs为动词-ing形式短语作主语。and后的分句是一个复合句：主句为they also cause serious ... abuse them, 其中who abuse them是定语从句，修饰________; although they enhance performance是________状语从句。