下列说法中正确的是（ ）
A．某一物体温度降低的多，放出热量就多
B．温度高的物体比温度低的物体含有热量多
C．温度总是从物体热的部分传递至冷的部分
D．深秋秧苗过夜要灌满水，是因为水的温度高
A、某一物体的质量和比热容都不变，由Q=cm△t可得，温度降低的多，放出热量就多；故A正确；
B、热量是过程量，描述它的术语是”吸收“和”放出“，不能用含有．故A错误；
C、具有温度差的物体才能够发生热传递，并且传递的是热量，即热量总是从物体温度高的部分传递至温度低的部分，故C错误；
D、深秋秧苗过夜要灌满水，是因为水的比热容较大，当温度下降时，由于水的比热容较大，放出相同的热量，温度不会下降太多，确保秧苗不被冻死．故D错误．
故选A．
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| Life gets noisier every day and very 1 people can be free from noise of some kind or another. Whether you live 2 the center of a modern city or a village far away---the chances that you will 3 by planes, cars, radios, etc, are almost everywhere. We seem 4 be used to noise, too. Some people feel quite lonely without background music while they are working. Tests have shown that total silence can be very frightening experiences. 5 , some people enjoy 6 to pop music which is very loud, and this can do harm to their ears. The noise level in some places is far above the usual safety level for heavy industrial areas. One recent report about 7 said that although 8 people say that any noise disturbs their attention, only a sudden change in the level of noise really affects people's attention. It goes on to say that a background noise, which doesn't change too much. Music, for example, may even help people to pay attention. People are testing ways to make 9 noise. There are even laws controlling noise. We cannot return to the "good old days" of peace and quiet. But we can make less noise---if we shout 10 about it. | ||||
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