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  3. Technically, any substance other than food that alters our bodily or mental functioning is a drug. Many people mistakenly believ

Technically, any substance other than food that alters our bodily or mental functioning is a drug. Many people mistakenly believ

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问题     Technically, any substance other than food that alters our bodily or mental functioning is a drug. Many people mistakenly believe the term drug refers only to some sort of medicine or an illegal chemical taken by drug addicts. They don’ t realize that familiar substances such as alcohol and tobacco are also drugs. This is why the more neutral term substance is now used by many physicians and psychologists. The phrase "substance abuse" is often used instead of " drug abuse" to make clear that substances such as alcohol and tobacco can be just as harmfully misused as heroin and cocaine.
    We live in a society in which the medicinal and social use of substances(drugs)is pervasive: an aspirin to quiet a headache, some wine to be sociable, coffee to get going in the morning, a cigarette for the nerves. When do these socially acceptable and apparently constructive uses of a substance become misuses? First of all, most substances taken in excess will produce negative effects such as poisoning or intense perceptual distortions. Repeated use of a substance can also lead to physical addiction or substance dependence. Dependence is marked first by an increased tolerance, with more and more of the substance required to produce the desired effect, and then by the appearance of unpleasant withdrawal symptoms when the substance is discontinued.
    Drugs(substances)that affect the central nervous system and alter perception, mood, and behaviour are known as psychoactive substances. Psychoactive substances are commonly grouped according to whether they are stimulants, depress ants, or hallucinogens. Stimulants initially speed up or activate the central nervous system, whereas depressants slow it down. Hallucinogens have their primary effect on perception, distorting and altering it in a variety of ways including producing hallucinations. These are the substances often called psychedelic(from the Greek word meaning "mind-manifesting")because they seemed to radically alter one’s state of consciousness.
Which of the following statements is true according to the passage?
选项 A、Those things that can change our body or mental function are called a drug.
B、Drugs merely refer to medicine or illegal chemicals.
C、Substances such as alcohol and tobacco also belong to drugs.
D、Drug abuse is more preferable to substance abuse.
答案C
解析 选项A，对应原文第一段第一句：除食品外，任何能改变我们生理和心理机能的物质均是药物。可知A项表达不够准确。选项B，第一段第二句指出许多人误以为(mistakenly believe)毒药仅指药品或违禁化学品。选项D恰好与原文意思相反。选项C定位于第一段第三句，酒精、烟草也是毒品。因此，正确答案是C。
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