练习四：

　　I have a friend.His mane is Henry Day, but everyone calls him Happy. Happy travels widely. Whenhe comes to a new place, he opens a pet shop and begins selling African GhostFish.

　　According to Happy, these are the world’s only invisible fish, and theyneed no food. Once a year, the female Ghost Fish lays eggs. Then, whileeverything is quiet, she becomes visible. But, in no time, she’s the mostbeautiful creature alive.

　　After Happy tells his customers this story,his fish tanks sell very quickly. When Happy sells out of fish tanks, heusually leaves for another town. He has rarely received a complaint since hebegan the business. In fact, many people take pleasure in looking at theirinvisible fish with their friends.

　　练习五：

　　Disneyland is afamous park in the USA. Its founder was Walt Disney (1901—1996). He is famousfor his cartoon characters such as Mickey Mouse, Donald Duck, Goofy and SnowWhite. Disney was born in the USA. After leaving school, he sold newspapers anddelivered letters. At the same time, he studied art at night. Finally, he got ajob drawing cartoons for films. Sometimes a mouse sat on Walt’s desk when hewas at work. He drew the mouse and put it in a cartoon. This became Disney’smost famous cartoon character ---- Mickey Mouse. Mickey soon became a star andDisney became rich and famous.

　　Disneyland opened in many places, such as inJapan and Hong Kong. Not only young people but also the old go to Disneylandfor fun.

　　练习六：

　　For thousands of years, people used different ways to measure things.Some people measured things using the size of their king's foot or hand. Whenthe king died, they used the new king's foot, and so on. This wasn't a good wayto measure things.

　　People all over the world used the sun andthe moon to measure time. However, they all had different numbers of days in aweek and different numbers of hours in a day. In 1584, one of the scientistsstarted to think about a set of measures which used the number ten, but no onewas interested in his ideas. About two hundred years later, many scientistsdecided to use metres to measure length and they worked out how long a metreshould be.