To help ourselves and others, it's important to know something about drugs. A drug is a chemical substance. It can bring about a physical, emotional, or mental change in people. Alcohol and tobacco are drugs. Caffeine, a substance found in coffee and some soft drinks, is also a drug.
为了帮助自己和其他人，了解毒品相关知识非常重要 。毒品是一种化学物质 。毒品可以使人们的身体、情感或者精神发生改变 。酒精和烟草也是毒品 。咖啡和一些软饮料中含有的咖啡因也是一种毒品 。
Drug abuse is the use of a drug, legal or illegal, that hurts a person or someone close to him. A drug user is the person who takes the drug. There are many kinds of drug users. Experimental users may try drugs once or twice. They want to see what the effects will be. Recreational users take drugs to get high. They use drugs with friends or at parties to get into the mood of things. Regular users take drugs all the time. But they are often able to keep up with the normal routine of work. Dependent users can't relate to anything but drugs. Their whole life centers around drugs. They feel extreme mental or physical pain without drugs. It's not always easy to tell that someone is using drugs.
毒品滥用是指合法或非法使用毒品伤害到某人或是某人身边的人 。吸毒者指那些吸毒的人 。有许多种吸毒者 。实验者会试一两次毒品 。他们想知道毒品有什么影响 。娱乐性吸毒者吸毒是为了爽一下 。他们会和朋友们一起吸毒或是在派对上吸毒，为的是进入一种情绪中 。经常吸毒者一直吸毒 。不过他们还是能正常工作的 。吸毒成瘾者除了毒品什么都不关心 。他们所有的生活重心都与毒品有关 。如果不吸毒他们就会感受到极端的精神痛苦或者身体痛苦 。一般很难分辨出谁是吸毒者 。
In the early stages, drug use is often hard to see. Sometimes, people like drugs or need drugs so much; they can't do without them. They are dependent upon drugs. Only a few kinds of drugs can cause physical dependence. But almost any drug, when it's misused, can make a person think he needs it all the time. By this time, it's too late and the person is hooked.
早期，很难看到有人使用毒品 。有时人们很喜欢毒品或非常需要毒品；没有毒品不行 。这就是吸毒成瘾 。只有几种毒品会产生身体依赖性 。不过，几乎所有毒品只要滥用，就会让人们认为他们一直需要毒品 。这时，一切为时已晚，人们已经吸毒上瘾了 。
Questions 16 to 18 are based on the passage you have just heard.
Question 16. What does the speaker say about drug abuse?
Question 17. What does the speaker say about recreational drug users?
Question 18. What does the speaker say about drug dependence?