单项选择题

Where is this article likely to be excerpted from

A．Biology textbook.
B．Scientific report.
C．Science fiction.
D．Essay.
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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
单项选择题
The word it (Line 7, Para. 6) probably refers to ______.
A．carbon dioxide
B．nitrogen'
C．atmosphere
D．coal
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