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

试卷相关题目

• 1biologist and engineer are interested in understanding natural silks because they are very light and brittle.

  A.right

  B.wrong

  C.not mentioned

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• 2silk’s strength comes from its weak hydrogen bonds working together.

  A.right

  B.wrong

  C.not mentioned

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• 3mit researchers carry out the study to illustrate an ancient chinese proverb.

  A.right

  B.wrong

  C.not mentioned

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• 4the 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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• 5rumors began to (circulate) about his financial problems.

  A.send

  B.spread

  C.hear

  D.confirm

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• 6the 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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• 7carbon nanotubes are currently the most popular topic in material science.

  A.right

  B.wrong

  C.not mentioned

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• 8it 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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• 9why 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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• 10what does kitso khama say about honey badgers、

  A.they are always looking for food.

  B.they do not enjoy human company.

  C.they show interest in things they are not familiar with.

  D.B.they do not enjoy human company.C.they show interest in things they are not familiar with.D.it is common for them to attack peopl

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