Which of the following plants is native to America、

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• 1Why do bumblebees gradually disappear、

  A.People are killing them．

  B.Scientists have ignored them．

  C.Honey bees have replaced bumblebees．

  D.Bumblebees' habitat is being destroyed．

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• 2Bumblebee is an insect _____．

  A.which feeds on tomatoes

  B.which is as big as a honeybee

  C.whose tongue is as long as a bat's

  D.which promotes the growth of tomatoes

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• 3The passage is probably followed by a paragraph about the          

  A.concerns about active retirement phase

  B.reasons for the birth of the odyssey phase

  C.influences of the odyssey phase on the society

  D.situations of active retirement in other countries

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• 4We can learn from Paragraph 5 that young people            

  A.favor the world full of changes

  B.grew up in unstable childhoods

  C.feel uneasy about the present situation

  D.may refer to the experience of their seniors

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• 5By 2000, most of the 30-year-olds ______．

  A.were financially dependent

  B.got well-prepared for the employment

  C.got married early and started their family

  D.preferred blog writing to newspaper reading

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• 6It can be concluded from the passage that _____．

  A.more attention will be paid to bumblebee study in America

  B.bumblebees will not be affected by the plants they pollinate

  C.great loss has been found in crops with bumblebees dying out

  D.more bumblebees will soon be found pollinating plants across America

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