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问题 选择题

下列关于温度、热量和内能的说法正确的是（   ）

A．0℃的冰可从0℃的水中吸热

B．100℃水的内能比0℃水的内能大

C．水的温度越高，所含热量越多

D．物体的内能不会为零

答案

答案：D

热量可以从高温物体传到低温物体，A错

内能指所有分子做无规则热运动的动能和分子势能之和，100℃水只是比0℃水分子平均动能大，由于不知道分子个数，所以内能大小未知，B错，热量是在热传递过程中才出现的，不能说物体含有热量，C错，所有物体都有内能且不为零，D对。

填空题

Perhaps, every county suffered from inflation once or more times. Inflation is an economic condition in (B1) prices for consumer goods (B2) , and the (B3) of money or purchasing power decreases. There are three causes of inflation. The first and most important cause may be excessive government spending. For example, in order to (B4) a war or carry (B5) social programs, the government may spend more money than it has received through taxes and other revenues, thus creating a deficit. In order to (B6) this deficit, the Treasury Department can simply (B7) the money supply by issuing more paper money to (B8) the debts of government. This increase in the money supply will cause the value of the dollar to (B9) decrease. The second cause of inflation occurs when the money supply increases faster than the supply of goods. (B10) people have more money, they will run out to buy popular goods (B11) televisions and computers, for example, and a shortage will result. Industry will then produce more, at higher prices, to (B12) demand. (B13) , if people think that the prices of popular goods are going up, they will buy and even borrow money at high (B14) rates to pay for them. Finally, if labor unions demand that workers’ wages (B15) or (B16) the high cost of living, industry will meet this demand and add other costs of production on the (B17) . (B18) summary, all of these causes can (B19) inflationary problems that can affect the welfare of a nation. However, of these three causes, (B20) government spending may be the most important.

A．protest

B．impose

C．cover

D．restrict
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填空题

乘客进入地铁付费区后，车票使用有效期为（）分钟，乘客应在（）出站。
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