However, at times this balance in nature is disturbed by human activities, _______ a number of possibly unforeseen effects.

试卷相关题目

• 1When the poor old lady tried to ______ the cup  on the shelf to have a drink, she ______.

  A.reach for; fell down

  B.reach; fell down

  C.reach for; had fallen down

  D.reach; was falling down

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• 2Without proper lessons, you could _______ a lot of bad habits when playing the piano.

  A.give up

  B.catch up

  C.pick up

  D.keep up

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• 3The athlete's years of hard working _______ when she finally won the Olympic gold medal.

  A.went on

  B.got over

  C.paid off

  D.ended up

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• 4--- Can your factory really afford ____ food for the people in the flooded area? --- I believe we can because we have ____ workers.

  A.anumberof;plentyof

  B.alargeamountof;thenumberof

  C.plentyof;thenumberof

  D.alargeamountof;anumberof

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• 5His parents died in the strong earthquake, so he was _______by his grandmother.

  A.grown up

  B.taken up

  C.make up

  D.brought up

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• 6He minds so much about his position in the office that he ____ any chance to be promoted.

  A.watches out for

  B.looks up

  C.points out

  D.watches out

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• 7______ the magazine today and you can get all the 26 magazines for just $ 99.

  A.Correspond to

  B.Attach to

  C.Appeal to

  D.Subscribe to

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• 8Some insects __________ the color of their surroundings to protect themselves.

  A.take in

  B.take on

  C.take over

  D.take off

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• 9Now I'm hungry and ____ a big meal; I had breakfast too early this morning.

  A.died to

  B.dying to

  C.dying for

  D.died for

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• 10Black clouds had completely _________ the sun.

  A.blocked off

  B.broken out

  C.blocked out

  D.broken off

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