25. 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

26 Where does the support for environmental protection mainly come from?

A. The grass –roots level

B. The business circle

C. Government officials

D. University professors

27 What have Americans achieved in environmental protection ?

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.

28. What is especially important for environmental protection according to the last paragraph?

B. Planning　　

C. Green living　　

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