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  3. What is the purpose of this passage? What happened to the leaves falling from the trees in the second study?

What is the purpose of this passage? What happened to the leaves falling from the trees in the second study?

admin2009-04-23  47
问题 What is the purpose of this passage?
What happened to the leaves falling from the trees in the second study?
选项 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 dioxide.
答案B
解析 客观事实题。关键语句:"They discovered that as the leaves broke down into the soil, all the carbon was not trapped in the soil. Much of it was released into the atmosphere as carbon dioxide."而A.C.D均错误。
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