Passage 2
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People all over the world today are beginning to hear and learn more and more about the problem of pollution. Pollution is caused either by man’s release of completely new and often artificial (人造) substances into the environment, or by releasing greatly increased amounts of a natural substance (物质), such as oil from oil tankers into the sea. Whatever its underlying reasons, there is no doubt that much of the pollution caused could be controlled if only companies, individuals and governments Would make more efforts. In the home there is an obvious need to control litter and waste. Food comes wrapped up three or four times in packages that all have to be disposed off drinks are increasingly sold in bottles or tins which cannot be reused. This not only causes a litter problem, but also is a great waste of resources, in ter A. the release of artificial or natural substances into the environment B. the production of new industrial goods C. increased amounts of a natural substance D. our ever-increasing population [单项选择]In developing countries people are pouring into overcrowded cities in great numbers．
A. 在发展中国家，人们正涌向一些拥挤的城市。 B. 在发展中国家，人们正大量涌向拥挤的城市。 C. 在发展中国家，人们大量涌向城市，使城市变得拥挤。 D. 在发展中国家，大批的人群正向城市移居，使城市很拥挤。 [单项选择]In some countries, students are expected to be quiet and （） in the classroom.
A. skeptical B. faithful C. obedient D. subsidiary 我来回答: 提交
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