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There are nearly 400 different types of sharks, but only about 30 types have even been reported as attacking human beings.
The chances of being attacked by a shark are very small compared to other dangers. Many more people drown（溺死）in the ocean every year than are bitten by sharks. The low number of attacks that happen every year proves that sharks do not feed on humans if they have the choice. There are three types of shark attacks. The main one is known as a ‘hit and run’. The shark attacks because it thinks you are a fish, but when it tastes a human it decides not to eat you. The second type is called a ‘bump and bite’. The shark bumps you to find out if you are fit to be eaten and then bites you if it thinks you are. The third type is called a ‘sneak’. When attacking in this way, the shark waits for you to swim by and attacks you suddenly. The latter（后者的）two types of attack are more likely to be deadly for humans.
However, your chances of being attacked by a shark can be reduced if you follow the advice below.
Do not swim in the dark. Sharks can still see you but you cannot see them.
Do not swim if you are cut or if you have a fresh wound. Sharks can smell blood over a long distance.
Do not wear bright clothing or jewellery because sharks are attracted to colours and shiny objects.
Try and stay in groups, as sharks usually avoid large numbers of people.
Don’t be frightened（受惊吓）by sharks as there is 30 times greater chance of being hit by lightning than being attacked by a shark.
【小题1】Are there only 30 types of sharks in the world?
【小题2】Are the chances of being attacked by a shark small or big compared to other dangers?
【小题3】What are the two deadly shark attacks called?
【小题4】Why should you try and stay in groups to avoid the shark attack?
【小题5】What does the writer mainly tell us in the passage? 查看习题详情和答案>>
B
If you want to find out a piece of information about anything , the best place to search for it is Wikepedia. This online encyclopedia is written by thousands of people around the world. Anyone can add or change the information if he or she finds it not correct or not well written. In this way, people who know a lot about a certain subject can write about it even if they are not university professors.
What is more, Wikepedia includes articles written in about 235 languages. This fact makes it one of the few websites (网站)on the Internet that are truly international. It was started in 2001 by Larry Sanger and Jimmy Wales, as a free online English-language encyclopedia project. By April 2008, over 10 million articles had been put on Wikipedia. A quarter of the articles are in English. Wikipedia is also a place where people can find the latest news.
However, Wikipedia has its own problems. There have been many complaints that some of the information on Wikipedia is not accurate and some important subjects are not included. This has led to arguments between the writers of articles. The people running Wikipedia say that the accuracy of the information is improving and that it is one of the top 20 visited websites on the Internet.
So, if you are looking for some information, why not try Wikipedia?
1.Wikipedia is ___________.
A．a computer game B．a name of a magazine
C．a free university D．an online encyclopedia
2.People who write on Wikipadia__________.
A．know much about a certain subject B．likes writing different stories
C．should be university professors D．are usually famous scientists
3.Wikipedia is truly international because_________.
A．everything is written in English
B．the articles are in about 253 language
C．there are over 10 million articles
D．each writer can write in different languages
4.Besides information about different subjects, people can also_____ on Wikipedia.
A．watch interesting movies B．send e-mail to friends
C．read about the latest news D．play exciting games
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—Jack, could you help me when the plane will take off on the Internet?
—I’m sorry, my computer doesn’t work.
A. get out B. look out C. take out D. find out
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(Frank and Alice are talking about childhood memories.)Frank: Look at this old photo. My mom sent it to me.
Alice: 1. ________
Frank: Yeah, with my best friend. We were in a primary school together.
Alice: How cute you were! Do you remember much about your primary school?
Frank: Not much. 2. ________ On the way home, I forgot to get off the school bus at my stop.
Alice: Oh, that’s really too bad!
Frank: And I was the last kid on the bus.
Alice: 3. ________
Frank: The bus driver had to call and find out my address. 4. ________
Alice: How old were you at that time?
Frank: 5. ________
Alice: You were lucky! I’m sure it won’t happen to you again.
| A. Oh, is this you? C. So how did you get home? E. He took me home at last. | B. I was only six. D. How did you get to school? F. But I still remember my first day of school. |
1
When tea and coffee were first introduced to Europe in the 18th century, people had different ideas about their use.Some said that tea and coffee were harmful to humans and they could cause （引起）people to die.
In Sweden（瑞典）, King Gustaf Ⅲ decided to find out whether or not this was true.It happened that there were two brothers in prison at that time.They were twins and were almost alike in every way.They had both been sentenced to death (判处死刑).The King decided to let them live if one of the men agreed to drink several cups of tea each day and the other several cups of coffee.
Both brothers lived many years without problems of any kind.At last,the brother who had drunk tea every day died at the age of 83,the other died a few years later.
Because of the experiment(实验), tea and coffee got accepted (接受) and became popular as drink in Sweden, and it is one of the many countries of the world where much tea and coffee is drunk today.
1.Tea and coffee were first introducd to Europe in_______.
A. the eighteenth century B. the eighteen century
C. eighteenth centuries D. eighteen centuries
2.What does the word harmful mean in Chinese?---It means________.
A. 有趣的 B.苦涩无味的 C.有害的 D. 可口的
3. The brother who had drunk tea every day lived______.
A. until he was over 83
B. until he was 83
C. until the other had been dead for several years
D. until he had drunk tea for a few years
4.. Today the Swedish drink_________.
A. much more coffee than tea B. much tea and coffee
C. little tea and coffee D. much tea but little coffee
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