At times the balance in nature is ______ , resulting in a number of possibly unforeseen effects.

试卷相关题目

• 1By all _______, you must try every _______ to help him.

  A.mean ,mean

  B.means ,means

  C.means ,mean

  D.mean ,means

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• 2I find it difficult to keep ________ of my old friends.

  A.company

  B.track

  C.touch

  D.pace

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• 3 All the children on the playground stared up into the sky until the noise of the plane _________.

  A.gaveup

  B.wentout

  C.diedaway

  D.tookoff

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• 4He is ill. He has kept _____.

  A.coughing all along

  B.to cough at night

  C.cough since yesterday

  D.being coughed day and night

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• 5Great men never give up _______ difficulty.

  A.in a face of

  B.in face of the

  C.in the face of

  D.in the face of the

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• 6It's______good feeling for student's to return to school after______summer vacation.

  A.a; the

  B.a; a

  C.a; the

  D.a; /

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• 7It was early in the morning and the traffic was ______.

  A.fluent

  B.free

  C.light

  D.little

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• 8The children put on _______ one-act play last Saturday._______ play amused everyone of us.

  A.an…..An

  B.a….An

  C.an…The

  D.a….The

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• 9She took the boy _____ the hand and led him _____ the zero.

  A.in…by

  B.on…at

  C.at…in

  D.by…round

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• 10I think everyone should donate blood _____ he is healthy because that's a citizen's responsibility.

  A.as if

  B.as long as

  C.now that

  D.in order that

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