Since the first Earth Day in 1970, Americans have gotten a lot "greener" toward the environment. "We didn’t know at that time th

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问题     Since the first Earth Day in 1970, Americans have gotten a lot "greener" toward the environment. "We didn’t know at that time there even was an environment, let alone that there was a problem with it, " says Bruce Anderson, president of Earth Day USA.
    But what began as nothing important in public affairs has grown into a social movement. Business people , political leaders, university professors, and especially millions of grass-roots Americans are taking part in the movement. "The understanding has increased many, many times, " says Gaylord Nelson, the former governor from Wisconsin, who thought up the first Earth Day.
    According to US government reports, emissions(排放)from cars and trucks have dropped from 10. 3 million tons a year to 5. 5 million tons. The number of cities producing CO beyond the standard has been reduced from 40 to 9. Although serious problems still remain and need to be dealt with, the world is a safer and healthier place. A kind of "green thinking" has become part of practices.
    Great improvement has been achieved. In 1988 there were only 600 recycling programs; today in 1995 there are about 6, 600. Advanced lights, motors, and building designs have helped save a lot of energy and therefore prevented pollution.
    Twenty-five years ago, there were hardly any education programs for environment. Today, it’s hard to find a public school, university, or law school that does not have such a kind of program. " Until we do that, nothing else will change!" says Bruce Anderson.
What have Americans achieved in environmental protection?

选项 A、They have cut car emissions to the lowest.
B、They have settled their environmental problems.
C、They have lowered their CO levels in forty cities.
D、They have reduced pollution through effective measures.

答案D

解析 美国环境保护所取得的众多成就,可在文中第三段中找出。汽车排放量降低了很多,但没有说降到最低,故A项错误;环境问题有所改善,但并没有解决,故B项错误;CO排放超标的城市从40个降到9个,而不一定是.降低了40个城市的CO水平,故C项错误;D项表述正确。故答案选D。
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