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问题：
[单选题]The rate of heat transfer from a hot region to a cold region is affected most by the （）.
A、size of the heat sink
B、temperature difference between the regions
C、size of the heat source
D、total heat of the system
参考答案：
B
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- ● Practice 1 Heat lo by weating depend on the fact that when a liquid evaporate, it aborb an enormou quantity of heat from it urrounding. Therefore, when I am of weat evaporate, a great deal of heat i aborbed from the urface of the body in contact with it. 1______ 2______ The firt i the amount of movement of air urrounding the body. The econd i the amount of water vapor in the air that urround the body. 3______ For thi reaon, weat evaporate very rapidly on windy day, and the rate of heat lo by weating i much more than on a till day. Thi account for the fact that hot till day are much le comfortable than hot windy day. In contrat, the weat evaporate very rapidly on hot windy day, and cool the body quickly and effectively. 4______ When air i carrying the maximum amount of water vapor that it can hold, it i aid to be 100% aturated with water vapor. The relative humidity of the air i aid to be 100%. Under thee condition the air cannot carry any water, o no water can evaporate. When the relative humidity i high, therefore, weat cannot evaporate. Intead, it form large drop and run off your kin without cooling you. 5______ It i obviou that under thee condition, evaporation will be much more rapid. Therefore, weating will be much more effective a a method of loing heat from the body. On a hot dry day, weat evaporate a oon a it i formed, and you feel reaonably cool even though the temperature of your environment i very high.[A] When the air i very dry and carrie no water at all, the relative humidity i aid to be 0%.[B] The econd factor i the amount of water vapor in the air－the humidity.[C] Hot windy day are much more comfortable than hot till day.[D] Thi heat tranfer occur even if the environment i hotter than the body.[E] When air move over the urface of water, the amount of evaporation i greatly increaed.[F] You might expect the highet incidence of a heat troke when the maximum temperature i 100 and humidity i 50%.[G] Two factor affect the rate of evaporation of weat, and therefore the effectivene of weating a a method of cooling the body.
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