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21. Einstein developed __________(理论)of relativity.

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15.转折点____________________   20.worm virus ________________

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14.登陆,着陆 ________________   19.give permission to _________

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13.自由勋章___________________   18. one giant leap____________

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12.试图_______________________   17. cut short________________ 

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11.海军飞行员_________________   16. out of control ____________

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10.(  ) A. make  B. talk  C. teach  D. learn from

Key: A) 1-5 DACBA   B) 1-5 CDDCB    C) 1-5 DACBA  

     D) 1-5 CADCA   E) 1-5 CADCD  6-10 BDCAC

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9.(  ) A. away from  B. with  C. in    D. into

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8.(  ) A. ask B. prevent C. make sure  D. find

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7.(  ) A. languages  B. pictures  C. songs    D. advice

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