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发布时间：2006-06-22 13:27     点击：

    (C) How might out understanding of the green- house effect be improved if the burning of fossil fuels were decreased?

    (D) What might cause a series of regular increases and decreases in the amount of CO2 in the atmosphere?

    (E) Why are there fewer meteorological recording stations in the Southern Hemisphere oceanic zone than elsewhere?

    22. The author's primarily concerned with

    (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

    (E) refuting hypotheses by climatologists about the causes of global temperature fluctuations

    23. 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 increase in short- wavelength radiation reaching the Earth

    (C) a slight long-term increase in global temperatures

    (D) a large long-term increase in the amount of volcanic activity

    (E) a slight short-term increase in atmospheric water vapor content

    24. The author refers to Venus primarily in order to

    (A) show the inherent weakness of the green- house effect theory

    (B) show that the greenhouse effect works on other planets but not on Earth

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