题目列表(包括答案和解析)

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19. A. about        B. in          C. out         D. for

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18. A. no        B. still          C. less         D. plenty of

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17. A. settling       B. working out      C. answering      D. dealing

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16. A. happens         B. develops        C. exists        D. appears

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15. A. must be true    B. will come true      C. can't be true     D. may be wrong

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14. A. animals      B. plants         C. forests       D. people

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13. A. Air pollution     B. Water pollution     C. Some diseases     D. All farmland

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12. A. saved        B. lost          C. discovered      D. used

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11. A. destroying      B. protecting       C. disturbing      D. interrupting

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10. A. wanted      B. lacked        C. found        D. expected

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