单项选择题

Which of the followings is NOT mentioned as a way against traffic accidents

A．Build more highways.
B．Stricter driving tests.
C．Test drivers every three years.
D．Raise age limit and lay down safety specifications.

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单项选择题

The passage suggests that a large decrease in the amount of CO2 in the atmosphere would result in ______.

A．at least a slight decrease in global temperatures
B．at the most a slight increases in short-wavelength radiation reaching the earth
C．a slight long-term increase in global temperatures
D．a slight short-term increase in global temperatures

单项选择题

The author is primarily concentrated on ______.

A．explaining the effects that the burning of fossil fuels might have on climate
B．illustrating the effects of CO₂ on atmospheric radiation
C．discussing effects that changes in the CO₂ level in the atmosphere might have on climate.
D．challenging hypotheses about the effects of water vapor and CO₂ on climate

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