问题 选择题

下列说法正确的是:

A.铁块很难被压缩说明分子间只存在斥力

B.两手搓搓感到热乎,这里是把机械能转化为内能

C.打扫卫生时,教室里尘土飞扬,这说明分子在不停地做无规则运动

D.一个物体的温度发生了改变,一定是发生了热传递

答案

答案:B

铁块很难被压缩不能说明分子间只存在斥力 ;两手搓搓感到热乎,这里是把机械能转化为内能; 打扫卫生时,教室里尘土飞扬,不是分子在不停地做无规则运动;一个物体的温度发生了改变,可能是发生了热传递,也可能是对它做功了。所以选B。

单项选择题

完形填空:下面的短文有l5处空白,请根据短文内容为每处空白确定l个最佳选项。

Obesity(肥胖) Causes Global Warming.

The list of ills attributable to obesity keeps growing: Last week, obese people were accused of causing global warming.

This ______(51)comes from Sheldon Jacobson of the University of Illinois, US, and a doctoral student, Laura McLay. Their study ______(52) how much extra gasoline is needed to haul fat Americans around. The answer, they say, is a billion gallons of gas per year. ______(53)

There has been ______(54) for taxes on junk food in recent years. US economist Martin Schmidt suggests a tax on fast food ______(55)to people’s cars. "We tax cigarettes partly because of their health cost," Schmidt said. "Similarly, leading a lazy life style will end ______(56) costing taxpayers more."

US political scientist Eric Oliver said his first instinct was to laugh at these gas and fast food arguments. But such ______(57) are getting attention.

At the US Obesity Society's annual meeting, one person ______(58) obesity with car accident deaths, and another correlated obesity with suicides. No one asked whether there was really a cause-and-effect relationship. " The funny thing was that everyone took it ______(59)." Oliver said.

In a 1960s study, children were ______(60) drawings of children with disabilities and without them, and a drawing of an obese child. They were asked ______(61) they would want for a friend? The obese child was picked last.Three researchers recently repeated the study ______(62) college students. Once again, ______(63) no one, not even obese people, liked the obese person. " Obesity was stigmatized." the researchers said.

But, researchers say, getting______ (64) is not like quitting smoking. People struggle to stop smoking, and, in the end, many succeed. Obesity is different. Science has shown that they have limited personal control over their weight Genes also______ (65) a part.

65.(单项选择题)        

A.decide

B.play

C.produce

D.use

选择题