单项选择题

These machines all look much the same, but each has its ______ function.

A．extraordinary
B．special
C．peculiar
D．exceptional
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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
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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