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.

　　Twenty­five 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 thatnothing else will change！" says Bruce Anderson.

　　【语篇解读】　本文是一篇说明文。介绍了环保意识在美国从无到有，逐渐增强，环保教育势在必行。

　　4．According to Anderson, before 1970, Americans had little idea about ．

　　A．the social movement

　　B．recycling techniques

　　C．environmental problems

　　D．the importance of Earth Day

　　C　[细节理解题。根据第一段第二句中的"'We didn't know at that time that there even was an environment，let alone that there was a problem with it'"可知，1970年以前美国人对环境问题所知甚少。]

　　5．Where does the support for environmental protection mainly come from?

　　A．The grassroots level.

B．The business circle.