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    • 所屬考試公共英語三級試題庫
    • 試題題型【閱讀理解 Section C】
        Heat loss by sweating depends on the fact that when a liquid evaporates, it absorbs an enormous quantity of heat from its surroundings. Therefore, when I am of sweat evaporate, a great deal of heat is absorbed from the surface of the body in contact with it. 1______
      2______ The first is the amount of movement of air surrounding the body. The second is the amount of water vapor in the air that surrounds the body.
      3______ For this reason, sweat evaporates very rapidly on windy days, and the rate of heat loss by sweating is much more than on a still day. This accounts for the fact that hot still days are much less comfortable than hot windy days. In contrast, the sweat evaporates very rapidly on hot windy days, and cools the body quickly and effectively.
      4______ When air is carrying the maximum amount of water vapor that it can hold, it is said to be 100% saturated with water vapor. The relative humidity of the air is said to be 100%. Under these conditions the air cannot carry any water, so no water can evaporate. When the relative humidity is high, therefore, sweat cannot evaporate. Instead, it forms large drops and runs off your skin without cooling you.
      5______ It is obvious that under these conditions, evaporation will be much more rapid. Therefore, sweating will be much more effective as a method of losing heat from the body. On a hot dry day, sweat evaporates as soon as it is formed, and you feel reasonably cool even though the temperature of your environment is very high.
    [A] When the air is very dry and carries no water at all, the relative humidity is said to be 0%.
    [B] The second factor is the amount of water vapor in the air-the humidity.
    [C] Hot windy days are much more comfortable than hot still days.
    [D] This heat transfer occurs even if the environment is hotter than the body.
    [E] When air moves over the surface of water, the amount of evaporation is greatly increased.
    [F] You might expect the highest incidence of a heat stroke when the maximum temperature is 100 and humidity is 50%.
    [G] Two factors affect the rate of evaporation of sweat, and therefore the effectiveness of sweating as a method of cooling the body.
      • 解題思路:倒數第二段說“當濕度是100%時,蒸發就不能進行了”。最后一段說“在這種情況下,蒸發速度很快”。說明空處講的是濕度很低的情況。故選A
        • 解題思路:本段講的是濕度對蒸發的影響。故選B。  
          • 解題思路:空前說“出汗能散熱是因為液體蒸發的時候可以帶走周圍大量的熱量。所以當我出汗時,大量的熱量被從身體表面吸走了”。D項說“即使周圍溫度筆體溫高時,熱量傳遞也是可以進行的”。符合邏輯關系。故選D。  
            • 解題思路:根據關鍵詞“the first,the second”可知,本段講的是兩大因素。G項說“影響汗水蒸發的因素有兩個”。符合邏輯關系。故選G。  
              • 解題思路:本段講的是空氣流動情況下汗水的蒸發狀況。E項說“當空氣在水的表面流動時,蒸發量大為增加”。符合文意。故選E。  
              • 參考答案:A,B,D,D,E