5AccordingtoAnderson,before1970,Americanshadlittleideaabout___

A.thesocialmovement

B.recyclingtechniqueszxxk

C.environmentalproblems

D.theimportanceofEarthDay

6Wheredoesthesupportforenvironmentalprotectionmainlycomefrom?

A.Thegrass–rootslevel

B.Thebusinesscircle

C.Governmentofficials

D.Universityprofessors

7.Whathave\Americansachievedinenvironmentalprotection?

A.Theyhavecutcaremissionstothelowest

B.Theyhavesettledthei