biologist and engineer are interested in understanding natural silks because they are very light and brittle.

试卷相关题目

• 1silk’s strength comes from its weak hydrogen bonds working together.

  A.right

  B.wrong

  C.not mentioned

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• 2mit researchers carry out the study to illustrate an ancient chinese proverb.

  A.right

  B.wrong

  C.not mentioned

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• 3the police will need to keep a (wary) eye on this area of town.

  A.naked

  B.cautious

  C.blind

  D.private

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• 4rumors began to (circulate) about his financial problems.

  A.send

  B.spread

  C.hear

  D.confirm

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• 5the proposal was (endorsed) the majority of members.

  A.rejected

  B.submitted

  C.considered

  D.approved

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• 6if the hydrogen bonds break due to external forces, they break fast.

  A.right

  B.wrong

  C.not mentioned

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• 7the mit team had tried different materials before they studied natural silk in their research.

  A.right

  B.wrong

  C.not mentioned

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• 8carbon nanotubes are currently the most popular topic in material science.

  A.right

  B.wrong

  C.not mentioned

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• 9it is indicated that materials stronger than natural silk can be expected in the future.

  A.right

  B.wrong

  C.not mentioned

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• 10why did the wild life experts visit the kalahari desert、

  A.to find where honey badgers live.

  B.to catch some honey badgers for food.

  C.to observe how honey badgers behae.

  D.C.to observe how honey badgers beha

  E.D.to find out why honey badgers have a bad reputation.

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