2. 外语
  3. 　　　　　 Because the low latitudes of the Earth, the areas near the equator, receive more heat 　　　 Than the latitudes near the pol

　　　　　 Because the low latitudes of the Earth, the areas near the equator, receive more heat 　　　 Than the latitudes near the pol

admin2004-12-30  77
问题 　　　　　 Because the low latitudes of the Earth, the areas near the equator, receive more heat
　　　 Than the latitudes near the poles, and because the nature of heat is to expand and move,
　　　 Heat is transported from the tropics to the middle and high latitudes. Some of this heat is
       Moved by winds and some by ocean currents, and some gets stored in the atmosphere in
(5)　   the form of latent heat. The term "latent heat" refers to the energy that has to be used to
　　　 Convert liquid water to water vapor. We know that if we warm a pan of water on a stove,
　　　 it will evaporate, or turn into vapor, faster than if it is allowed to sit at room temperature.
　　　 We also know that if we hang wet clothes outside in the summertime they will dry faster
　　　 than in winter, when temperatures are colder. The energy used in both cases to change
(10)　  liquid water to water vapor is supplied by heat―supplied by the stove in the first case
　　　 and by the Sun in the latter case. This energy is not lost. It is stored in water vapor in the
　　　 atmosphere as latent heat. Eventually, the water stored as vapor in the atmosphere will
　　　 condense to liquid again, and the energy will be released to the atmosphere.
　　　　　 In the atmosphere, a large portion of the Sun’s incoming energy is used to evaporate
(15)　  Water, primarily in the tropical oceans. Scientists have tried to quantify this proportion
　　　 of the Sun’s energy. By analyzing temperature, water vapor, and wind data around the
　　　 globe, they have estimated the quantity to be about 90 watts per square meter, or nearly
　　　 30 percent of the Sun’s energy. Once this latent heat is stored within the atmosphere, it
　　　 can be transported, primarily to higher latitudes, by prevailing, large-scale winds. Or it
(20)　  can be transported vertically to higher levels in the atmosphere, where it forms clouds
　　　 and subsequent storms, which then release the energy back to the atmosphere.
选项 A、is transformed and transported in the Earth’s atmosphere
B、is transported by ocean currents
C、can be measured and analyzed by scientists
D、moves about the Earth’s equator
答案A
解析
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