D．115 to 137 km

　　18．The main purpose of the passage is ________.

　　A．to inform readers of the damage caused by air pollution

　　B．to introduce the new plan to control air pollution

　　C．to provide official figures of air pollution levels

　　D．to point out the regions affected by air pollution

　　19．What does the underlined phrase “the true picture” in the last paragraph mean?

　　A．The major pollutants.

　　B．The key polluted areas.

　　C．The major polluted cities.

　　D．The pollution levels.

　　Ⅲ.任务型阅读

　　请认真阅读下列短文，并根据所读内容在文章后表格中的空格里填入一个最恰当的单词。

　　注意：每个空格只填1个单词。

　　Many cities around the world today are heavily polluted.Careless methods of production and lack of consumer demand for environment friendly products have contributed to the pollution problem.One result is that millions of tons of glass，paper，plastic，and metal containers are produced，and these are difficult to get rid of.

　　However，today，more and more consumers are choosing “green” and demanding that the products they buy should be safe for the environment.Before they buy a product，they asked questions like these，“Will this shampoo damage the environment？” “Can this metal container be reused or can it only be used once？”

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