单项选择题

Scientist 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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单项选择题
The word it (Line 7, Para. 6) probably refers to ________.
A．carbon dioxide
B．nitrogen
C．atmosphere
D．coal
单项选择题
What 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 dioxide.
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