任务型阅读。从A-D中选出恰当的句子填入文中1-4处,然后回答第5题. What would you do if a stranger gave you some medicine a nd he said it would keep you slim or help you do well in exams? Would you take it? Many middle school students have learned to keep themselves safe by saying 'no'. __ 1 __ Drugs are dangerous to your health! Because most of teens don't know much about drugs, they might want to try them. Liu, 16, was a good student before trying drugs. __ 2 __  He decided to have a try. After taking drugs only once, he found it very hard to stop. Liu began to spend all his time and money on drugs. Soon, he stopped going to school and started stealing (偷).__ 3 __. In China, taking drugs is becoming a big problem for teens. According to a survey, about one million people in China are using illegal drugs now, and about 74% of them are young people. __ 4 __ Drugs are dangerous. Never try them, even if you're curious! It is the most important for you to k eep safe and healthy. A. In the end, he was put in prison. B. In fact, what those strangers want to give them are drugs (毒品). C. What's worse, there are about 10,000 drug users under 16 now. D. One day, some old friends told him it woul d be fun. 5. According to a survey, about    young people in China are using illegal drugs now. A. 1,000,000 B. 100,000 C. 10,000 D. 740,000