Where is this article likely to be excerpted from、

试卷相关题目

• 1The word "it" (Line 7, Par

  A.6) probably refers to ____.A.carbon dioxide

  B.nitrogen

  C.atmosphere

  D.coal

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• 2Scientist Ram Oren is of the opinion that common beliefs of the tree's ability to absorb carbon dioxide are____.

  A.biased

  B.insightful

  C.overoptimistic

  D.totally wrong

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• 3What happened to the leaves falling from the trees in the second study、

  A.They broke down and the main parts turned into oxygen.

  B.They broke down and the carbon content had mainly turned into carbon dioxide.

  C.They broke down and the carbon content was mainly absorbed in the soil.

  D.They absorbed more carbon dioxid

  E.

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• 4Why researchers put trees in extra carbon dioxide in the first study、

  A.To learn whether trees can still absorb carbon dioxide under extreme conditions.

  B.To get more oxygen from these trees.

  C.To evaluate the maximum carbon dioxide that trees can absorb.

  D.To see the growth rate of these trees.

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• 5What is the purpose of this passage、

  A.Introduce some new ideas about the relationship between trees and carbon dioxide.

  B.Introduce recent condition of global industrial pollution.

  C.Call on people to plant more trees to reduce greenhouse gases.

  D.Point out that power companies should be responsible for the rising levels of carbon dioxid

  E.

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• 6One advantage with Nostrils high on the head is to ____.

  A.use sense of smell more efficiently

  B.help them move fast and alert

  C.enable them to find more food

  D.help them live under water more easily

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• 7Which of the following may not be a reason why Professor Witmer studies crocodiles and lizards in his experiments、

  A.They are close relatives to dinosaurs.

  B.Their soft tissues survive as fossil remains.

  C.Their soft tissues have similar traits with dinosaurs.

  D.He cannot find living dinosaurs.

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• 8What does "this information" (in paragraph 7) refer to、

  A.Soft tissues.

  B.Bone.

  C.Markings.

  D.Nos

  E.

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• 9The word "passage" (Line 2, Par

  A.8) means____.A.gate

  B.channel

  C.cross

  D.paragraph

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• 10Which one is NOT mentioned in this passage that can be the source of carbon dioxide、

  A.Oil.

  B.Trees.

  C.Woo

  D.D.Soil.

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