听力原文： We live in a society in which the medicinal and s...
未知题型听力原文： We live in a society in which the medicinal and social use of substances is pervasive: an aspirin to quiet a headache, some wine to be sociable, coffee to refresh oneself in the morning. When do these socially acceptable and apparently constructive uses of a substance become misuses? Most substances taken in excessively will produce negative effects such as poisoning. Repeated use of a substance can also lead to addiction or substance dependencE.Dependence is marked first by an increased tolerance, and then by the appearance of withdrawal symptoms when the substance is discontinueD.
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