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  3. Conger’s experiment with two groups of rats The main purpose of the text is to

Conger’s experiment with two groups of rats The main purpose of the text is to

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问题 Conger’s experiment with two groups of rats
The main purpose of the text is to
选项 A、introduce some theories about alcoholism.
B、help alcoholics and others to understand the cause of alcoholism.
C、explain the application of a psychological approach to alcoholism.
D、show the most effective new treatment of alcoholism.
答案B
解析 主旨大意题。文章首先提到了有关酗酒的诸多理论，随后具体介绍了学习和强化理论对酗酒的解释，接着指出过度饮酒所导致的忧虑与负疚感可能本身就成为另一次酗酒的导火线。因此，本文主要是在解释酗酒的原因，选项B正确。文章只在第一段提到了有关酗酒的理论，所以A不全面；C和D属于无中生有。
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