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Lesson 38 acidic adj. 酸的，酸性的 alcohol n. 酒精 bactericidal adj. 杀菌的 carbonated adj. 碳化的，碳酸的 contamination n. 污染 disinfectant n. 消毒剂 ethanol n. 乙醇 intermittent adj. 间歇的，断断续续的 leakage n. 泄...
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Lesson 36 The cost of government 政府的开支 First listen and then answer the following question. 听录音，然后回答以下问题。 What is the most important factor, both in government or business, for keeping running costs low? If a natio...
When will it be possible for us to think seriously about colonising Mars? The Moon is likely to become the industrial hub of the Solar System, supplying the rocket fuels fro its ships, easily obtainable from the lunar rocks in the from of liquid oxyg...
Lesson 34 Adolescence 青春期 First listen and then answer the following question. 听录音，然后回答以下问题。 What do adolescents respect in parents? Parents are often upset when their children praise the homes of their friends and reg...
