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
According to this passage, those people disagree with the control of carbon dioxide because _________.
A．they think that carbon is beneficial for plant growth
B．they want to use more fuels that can emit carbon dioxide
C．they think carbon dioxide is not the main reason for global warming
D．they think it will destroy the natural balance of gases in the world
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