问题 选择题

下列事例中属于防止蒸发吸热产生危害的是(  )

A.没有汗腺的狗,酷暑时伸长舌头来散热

B.夏天下暴雨,衣服淋湿后要换干衣服

C.病人发烧时常用湿毛巾敷头部

D.夏天在教室地上洒些水

答案

解;A、狗伸长舌头,舌头上的水分蒸发就会吸收热量,降低狗的温度,利用了蒸发吸热;不合题意.

B、衣服淋湿后,衣服上的水蒸发从身体上吸热,会使人感冒,要换衣服,防止蒸发吸热;符合题意.

C、用湿毛巾敷头部水蒸发从发烧的病人身上吸收热量,防止病人温度过高,发生危险.利用蒸发吸热,不合题意.

D、在地上洒水,水在常温下就可以蒸发,蒸发要吸热,吸收空气中的热量使空气的温度降低.利用蒸发吸热,不合题意.

故选B.

阅读理解

I credit my typing skill to so many hours of chatting online. Unfortunately, as my typing speed increased on the Internet, all grammatical rules went out of the window. You see instant messages have their own shorthand language and grammar isn’t important, of which even a newbie (新手) is aware. They can leave out articles, subjects (主语), pronouns, etc. They can misspell or “respell” almost any word. They often ask “A/S/L” when they first chat. Abbreviations (缩写) and capitalizations (大写) are particularly important. English-speaking instant messengers also refuse to burden themselves with punctuation and capitalization.

After I came back China, I discovered not one but two instant messaging crazes. The first, which brought back memories of my previous addiction to the computer, was QQ. I can see evidence that the Chinese have the same kind of separate instant messaging language, even when they chat in English. My first word in this language, for example, was “ft”. This abbreviation for “faint” is used whenever there is a need to express surprise. I also discovered that Chinese use the same kind of abbreviation for a laugh. And there is an extraordinary number of smileys (表情符) to the “vomit” and “army soldier” smileys. There is even a SARA smiley.

After QQ, there is another, perhaps more widespread messaging trend. You guessed it --- cell phone text messaging. I now understand how useful text messaging is and why it is so common. I admit that I have been guilty of sending text messages while walking outside or sitting on the subway. Who hasn’t ? No matter where I go, I see people on their cell phones, messaging. In fact, it’s rare to see someone actually talking on their phone!

So it looks as if there is no escape from the instant messaging crazes, no matter where in the world I go. And that’s plainly not going to change. In the end, though, I can’t complain: instant messaging is quick, it’s cheap, it’s easy and it’s extremely fun too. And after all, everyone’s doing it.

小题1:The underlined phrase “went out of the window” in Paragraph 1 probably means        .

A.increased

B.occurred

C.disappeared

D.changed小题2:Which of the following is true according to the passage?

A.Grammar and correct spelling are very important while chatting online.

B.There are enough smileys and icons to express yourselves while chatting on line.

C.The writer is skilled at typing and once was addicted to online games.

D.It is impolite to leave out some unimportant words or letters while chatting online.小题3:The writer believes that instant messaging is          .

A.full of fun but time-consuming

B.widespread but unnecessary

C.quick but difficult to do

D.common, used and cheap小题4:Which might be the main idea of the passage?

A.Who can escape QQ and cell phone text messaging?

B.Why is instant messaging so popular?

C.Chatting online is good for your typing skill.

D.Chatting on QQ is natural for people.

判断题