Most birds find it safe to sleep in the trees, but ____ they have eggs or young chicks, they don't use a nest.

试卷相关题目

• 1Just as too much harmony is tiresome in music,________.

  A.the life of too many benefits annoys us

  B.so, in life, too many benefits annoy us

  C.we are annoyed with lives also of too many benefits

  D.a lot of benefits annoy us in life

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• 2—Do you think we can get there on time? —Yes,_________ the bus does not break down.

  A.even if

  B.unless

  C.until

  D.so long as

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• 3He does so little work in the office that for all practical purposes it would make no difference _______ he didn't come.

  A.if

  B.when

  C.why

  D.whether

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• 4It is difficult for us to learn a lesson in life _____we've actually had that lesson.

  A.until

  B.after

  C.since

  D.when

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• 5 Although he knew little about the large amount of work done in the field , he succeeded ____other more well-informed experimenters failed.

  A.as

  B.unless

  C.what

  D.where

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• 6____ you may be right , I can't agree completely.

  A.While

  B.As

  C.If

  D.Since

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• 7―I've already made up my mind. ―________, there's no point discussing it now.

  A.In case

  B.In that case

  C.On the case

  D.As the case may be

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• 8_A container weighs more after air is put in, ________ proves that air has weight.

  A.as

  B.it

  C.that

  D.which

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• 9We are living in an age ______ many things are done on computer.

  A.which

  B.that

  C.whose

  D.when

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• 10 —It seems that his health is improving. —Yes. It is ten years _______ he _________.

  A.that, smoked

  B.after, didn't smoke

  C.since, smoked

  D.before, smoked

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