In the late 1960s , motorcyclists in California , USA , (16 ) to go out in the countryside and ride their machines up and down mountain tracks just for fun. They made (17) noise and did a lot of dama
16. A. had been used B. has been used C. used D. was used
17. A. many B. much C. any D. some
18. A. as well B. either C. too D. as well as
19. A. was born B. is born C. were born D. are born
20. A. when B. how C. which D. where
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The author regards the appeal to education reform. in the 1950s and the 1960s chiefly as _