单项选择题

Which one is NOT mentioned in this passage that can be the source of carbon dioxide

A．Oil.
B．Trees.
C．Wood.
D．Soil.
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单项选择题
The word issue in the last paragraph can be replaced as _________.
A．organ
B．topic
C．publication
D．result
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
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