It takes years of ________ practice to gain the skill of ________ expert．

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• 1As a famous biologist, he has ________ eye for ________ biology．

  A.an; a

  B./; the

  C.an;/

  D./;/

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• 2It always snows at ______ Christmas, but I can't remember ______ Christmas when it snowed so much．

  A.不填；a

  B.the; the

  C.a; a

  D.不填；不填

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• 3Most animals have little connection with _________ animals of _________ different kind unless they kill them for food．

  A.the; a

  B.不填; a

  C.the; the

  D.不填; the

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• 4From the top of the building, you can see at least ________ distance of 100 kilometers on ________ clear day．

  A.a ;the

  B./ ;a

  C.the ;a

  D.a;a

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• 5He likes studying ________ ancient history and can remember many events happening in ________ history very clearly．

  A./;/

  B.the;/

  C.the; the

  D./; the

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• 6There are many people still leading ________ life under ________ poverty line in the world．

  A.the;不填

  B.a;不填

  C.a; a

  D.a; the

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• 7Some parents believe that ________ boy must learn to stand up and fight like ________．

  A.a; a man

  B.a; the man

  C.the; men

  D.the; a man

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• 8Lei Feng was ________ name that won national admiration in ________ 1960s, as a symbol of unselfishness and devotion．

  A.the; the

  B.a; a

  C.the; 不填

  D.a; the

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• 9It is ________ great honor to be invited here to give ________ speech on how to give first aid to the injured．

  A.a ,a

  B.a ,the

  C.the ,the

  D.the ,a

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• 10The sportsman didn't manage to break _________ record, but it was _________ good try．

  A.a ,the

  B.the,a

  C.a，不填

  D.the，不填

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