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发布时间：2006-06-22 13:27     点击：

    (C) show the extent to which Earth's atmosphere differs from that of Venus

    (D) support the contention that as water vapor increases, the amount of CO2 increases

    (E) support the argument that the CO2 level in the atmosphere has a significant effect on climate

    25. The passage suggests that if there were a slight global warming at the present time, it would be

    (A) easy to measure the exact increase in temperature because of the abundance of temperature recording stations throughout the world

    (B) difficult to measure the increase of CO2 in the atmosphere because of local variations in amounts

    (C) easy to demonstrate the effects of the warming on the water vapor in the atmosphere

    (D) difficult to prove that the warming was caused by the burning of fossil fuels

    (E) easy to prove that the warming was caused by an increase of cloud cover

    26. The discussion of climate in the passage suggests which of the following conclusions?

    Ⅰ Climate is not perfectly stable, and slight regional temperature variations can be considered a normal feature of the environment.

    Ⅱ We are unable at present to measure global temperature changes precisely

    Ⅲ The most important cause of regional climatic fluctuations is the change in CO2 levels in the atmosphere.

    (A)Ⅰonly

    (B) Ⅲ only

    (C)ⅠandⅡonly

    (D)Ⅱand Ⅲ only

    (E)Ⅰ,Ⅱ, and Ⅲ

    27. All of the following can be found in the author's discussion of climate EXCEPT.

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