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

试卷相关题目

• 1Why 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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• 2What 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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• 3What is scientists' attitude towards the future of Chad Lake、

  A.Pessimism.

  B.Hopeful. 

  C.Indifferent.

  D.Doubtful.

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• 4Why computer data become imprecise in 1980s、 

  A.The related programs on the computer were out of date. 

  B.More and more people drew water directly from the lake for drink. 

  C.A heavy rain happened around 1980. 

  D.The irrigation from the source water increases.

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• 5Which of the following is true according to this passage、

  A.Chad Lake located in the middle of Chad in northern Africa.

  B.The water from Chad water can now only be used for irrigation.

  C.The area around Chad Lake has suffered from heavy rain lack many decades.

  D.Population around the Chad Lake now begins to decrease due to water lack.

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• 6Scientist 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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• 7The word "it" (Line 7, Par

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

  B.nitrogen

  C.atmosphere

  D.coal

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• 8Where is this article likely to be excerpted from、

  A.Biology textbook.

  B.Scientific report.

  C.Science fiction.

  D.Essay.

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• 9One 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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• 10Which 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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