单项选择题

The committee report of National Academy of Sciences in Washington reveal that _________.

A．ice from Antarctica and Greenland is appropriate to show the change
B．carbon dioxide is released mainly from the fuel
C．level of carbon dioxide increases with global temperatures
D．carbon dioxide is helpful for tree growth
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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
It can be inferred from Berger's suggestions that _________.
A．people do not reveal their true self on every occasion
B．in most cases we should avoid contacting the observed person’directly
C．the best way to know a person is by making comparisons
D．face-to-face interaction is the best strategy to uncover information about a person
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