问题 选择题

关于热现象的下列分析不正确的是(  )

A.0℃的冰变成0℃的水,因温度不变;所以它的内能不变

B.灯泡用久了,钨丝变细,是因钨丝升华的缘故

C.夏天冰棍周围出现“白气”,是空气中的水蒸气液化形成的

D.寒冷冬天的早晨,窗上的冰花是水蒸气凝华形成的

答案

A、0℃的水变成0℃的冰的过程中,虽然温度没变,但其体积发生了变化,故其内能也发生了改变,且此时其内能变大,故该选项符合题意;

B、灯丝变细,即是由钨晶体直接变成了气体,故由固体直接 变为气体,即是升华,故该选项不符合题意;

C、夏天冰棒周围的白气是由于空气中的高温水真气直接变成了小液滴,故是由气体变为液体,故是液化,所以该选项也不符合题意;

D、冬天窗上的冰花是由水蒸气直接变成的小冰粒,故是气体直接变为固体,所以是凝华,故该选项也不符合题意.

故选A.

阅读理解

根据短文内容,完成文后任务。注意:62-65小题每题回答不超过三个词。

Many people would like to watch sport matches. First, you need to know about audience manners.

Most sporting arenas(竞技场) have rules for audience written on the back of the tickets. Read your ticket carefully before you arrive. Try to reach your seat half an hour before the start of the event and don’t leave when a game is in progress. When you leave, remember to take away your soft drink bottle and other rubbish.

During exciting games, try to control yourself. Don’t criticize(批评)the performance of players and coaches. Be careful with your words, since some may cause anger among other people in the audience

Applause(鼓掌)is a special form of body language you can use to communicate with players, but you should do it properly. When players first appear, clap your hands together to welcome them, but don’t go on for too long. After an excellent performance, applaud warmly. If someone fails, your applause will help encourage them.

Applause is not welcome, however, while players need to keep their concentration. Various sports have various rules for the audience.

Enjoy artistic gymnastics silently. But lots of cheering can really help basketball and football players. Snooker and table tennis courtside behavior includes a ban on flash photography. Mobile phones are not allowed in shooting centers.

To be good audience, you should spend time learning the specific(明确的) rules and the culture of each event.

小题1:What shouldn’t you do after you watch a game?

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小题2:Applause is always welcome, isn’t it?

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小题3: How many events are mentioned in the passage?

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小题4:What’s the best title of the passage?

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小题5:Translate the underlined part into Chinese.

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单项选择题