B

   Many years ago when people had no thermometers, they usually touches a thing to see how hot or cold it was. The following experiment shows how easy it was to make a mistake.

Take three glasses: the first one with very hot water, the second one with very cold water, and the third one with water at room temperature. Then you put a finger of one hand in the hot water, and a finger of other hand in the cold water. You hold your gingers in the two glasses for a minute. Then you use each finger, one after another, to see how hot or cold the water in the third glass is. You will find that the water is warm to the finger that was in the cold water before, but the finger which was in the hot water, will feel cold in the same glass of the water. 

That is why you must always find the temperature in a scientific way. You must not try to tell the temperature as it seems to you.

You will often make a mistake if you take something that seems to you for a real fact. For example, when you are going to an Amusement park by bus and you want to get there very quickly, it seems to you that your bus is going very slowly, slower than the other buses. But if it is Sunday and you have much free time, it seems to you all the buses and cars are going very fast.

46. The experiment tells us than sometimes it is        to make a mistake.

A. interesting           B. difficult

C. easy              D. helpful

47. The water in the third glass  is        .

A. colder than the water in the first glass

B. hotter than the water in the first glass

C. colder than the water in the second glass

D. as cold as the water in the second glass

48. What will you find if you put the finger which was in the first glass into the second glass according to the experiment?

A. The water is hotter than it is in the first glass.

B. The water is as hot as it is in the first glass.

C. The water is at room temperature.

D. The water is colder than it is in the first glass.

49. How should we find the temperature according to the passage?

   A. Try to tell as it seems to us.

B. Try to use our fingers.

C. Try to tell in a scientific way.

D. Try to touch something to see how hot it is.

50. We can learn something about        from the passage.

   A. physics         B. chemistry

C. psychology        D. biology

A

How to apply for a free mailbox?

   First you have to connect to the internet and go to the home pages of the ICP providing free mailboxes. Then you will find an icon showing “apply for a free mailbox”. Click the icon, an agreement about the rules for using the free mailbox will appear. If you want to go on, click the icon “I agree”. Then you have to fill in a form about your basic personal data. After finishing these, you will get a mailbox like this: your name@mail server (For example: “tvguide@”“tvguide”is the name of the mailbox, and“ ”is the name of the mail server). The mailbox is separated into two parts by a separator“@”, which is read as “at”. The former part is the name of the mailbox. The later is the domain name(域名)of the mail server. All mails to you will be received by the server and put into your mailbox. You can read these mails on any computers in the world, as long as you have the name and pin of the mailbox.

41.If you want to send or receive an e-mail, you should first        .

A. fill in a form

B. go to the post office

C. write a letter to the ICPs

D. apply for a mailbox

42. When you get a free mailbox, you can send an e-mail      .

A. to anyone

B. at anytime

C. without paying any money

D. at anywhere

43. Here is an e-mail address johnboown@ What is the mailbox’s name? It’s       .       .

            B. johnbrown

C. mail              

44. The writer mainly wants to tell us how to        in this passage.

A. find out one’s e-mail address

B. read the e-mail on computer in the world

C. send a letter by e-mail

D. set up a free e-mail box

45. What does the underline word pin mean in this passage?

  A.数据         B.指针

  C.密码         D.符号

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