单项选择题

The word "issue" in the last paragraph can be replaced as ________.

A．organ
B．topic
C．publication
D．result
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单项选择题
Those studies carried out in North Carolina suggest that ________.
A．trees’function for absorbing carbon dioxide is limited
B．carbon dioxide is the main cause for global warming
C．leaves falling from trees can emit more oxygen
D．more carbon dioxide is beneficial for trees’growth for many decades
单项选择题
According to the passage, dwindle means ________.
A．decrease
B．enlarge
C．weaken
D．elimilate
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