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Practice 1 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.
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更多 “问答题Practice 1 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.” 相关考题
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know how to iron certain clothes materialB
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单选题Many American travelers use Montreal international airport because ______.A
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问答题Practice 1 The French division of McDonald’s has run advertisements that included a surprising 1 :Kids shouldn’t eat at McDonald’s more than once a week. The advertisements, 2 information from specialists,, aim to show that “McDonald’s meals are part of a balanced weekly diet,” said Euro RSCG, the agency that came up with the ads, which appeared this spring, mostly in French women’s magazines. Alongside quotes from specialists addressing 3 and diets for children, the ads described how McDonald’s hamburgers are made of 100 percent real beef and cooked on a grill free of 4 oil. One ad placed in Femme Actuelle in April quoted a nutritionist who said, “there’s no reason to 5 fast food, or visit McDonald’s more than once a week. ” The McDonald’s Corp., based in Oak Brook, Ⅲ. ,said in a statement Wednesday that it “strongly 6 ”with the nutritionist quoted in the French advertisement. “The vast majority of nutrition professionals say that McDonald’s food can be and is a part of a healthy diet based on the sound nutrition 7 of balance, variety and moderation(适度),” the statement said. Since opening its first French branch in l968, McDonald’s has expanded 8 in France. More recently the multinational has come under fire from anti-globalization 9 ,farmers’ groups, and in Paris, striking workers. Last year, sheep farmer-turned-activist Jose Bove became a standard-bearer for the French anti-globalization 10 when he led a group that ransacked(洗劫)a McDonald’s in southern France.[A] quoting [B] continuously [C] overweight[D] suggestion [E] abuse [F] protestors[G] occasionally [H] additional [I] tame[J] movement [K] disagreed [L] healed[M] principles [N] conference [O] prosperous
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考题
单选题The passage aims to tell ______.A
the real meaning of happinessB
the great importance of happinessC
the constant pursuit of happinessD
the changing concept of happiness
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