23. Paragraph 1

　　24. Paragraph 3

　　25. Paragraph 4

　　26. Paragraph 5

　　A. The prediction of the model

　　B. The influence on temperature

　　C. The effect of carbon dioxide

　　D. The potential problem

　　E. The import of the assumption

　　F. The serious consequences

　　27. Nowadays, too much carbon dioxide

　　28. The radiating level and the temperature of the surface must rise because of the

　　29. Only if the amount of water vapor in the atmosphere increases as the temperature rises, the atmosphere s relative humidity

　　30. An increase in the amount of carbon dioxide means that there are more molecules of carbon dioxide

　　A. will be constant

　　B. to absorb infrared radiation

　　C. is becoming the potential problem

　　D. prepare ourselves to be chemists, physicist

　　E. increasing capacity of the atmosphere to absorb infrared radiation.

　　F. escape from the earth much more easily

　　参考译文

　　二氧化碳分子在地球大气中起着单向屏障的作用，影响了地球的热平衡。尽管这些分子微粒允许可见光波长的辐射穿过，但是，它们吸收一些来自地球表面具有较长波长的红外线辐射，这些辐射原本是应该传回太空的。为了使地球保持稳定的平均温度，这种来自地球的辐射必须与射入的太阳辐射保持平衡。假设大气中没有二氧化碳，热量将会更加容易地从地球上散失，地表温度将会非常低，以致海洋可能变成固体冰块。

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