题目内容

Today, roller skating is easy and fun. But a long time ago, it wasn’t easy at all. Before 1750, the idea of skating didn’t exist. That changed because of a man named Joseph Merlin. Merlin’s work was making musical instruments. In his spare time he liked to play the violin. Joseph Merlin was a man of ideas and dreams. People called him a dreamer.

One day Merlin received an invitation to attend a fancy dress ball. He was very pleased and a little excited. As the day of the party came near, Merlin began to think how to make a grand entrance at the party. He had an idea. He thought he would get a lot of attention if he could skate into the room.

Merlin tried different ways to make himself roll. Finally, he decided to put two wheels under each shoe. These were the first roller skates. Merlin was very proud of his invention and dreamed of arriving at the party on wheels while playing the violin.

On the night of the party Merlin rolled into the room playing his violin. Everyone was greatly surprised to see him. There was just one problem. Merlin had no way to stop his roller skates. He rolled on and on. Suddenly, he ran into a huge mirror that was hanging on the wall. Down fell the mirror, breaking to pieces. Nobody forgot Merlin’s grand entrance for a long time!

1.The text is mainly about __________.

A. a strange man

B. an unusual party

C. how roller skating began

D. how people enjoyed themselves in the 18th century

2.People thought Merlin was a dreamer because he __________.

A. was full of imagination

B. was a gifted musician

C. invented the roller skates

D. often gave others surprises

3.Merlin put wheels under his shoes in order to __________.

A. show his skill in walking on wheels

B. arrive at the party sooner

C. test his invention

D. impress the party guests

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Imagine what you could do with a machine that could make things disappear.

For inspiration, you could read some books. In the books of J.R.R. Tolkein, Bilbo Baggins finds a ring that can make him disappear. Of course, there’s also poor Harry Potter, who used his invisibility cloak (隐形斗篷) to hide from danger.

Now that you’ve got some ideas, it’s time for the hard part: building the cloak. To do that, you have to give up science fiction and turn to real science. An invisibility cloak has to cheat anything or anyone who might be watching. In order to understand how something can be seen, it’s important to understand how we see.

Human beings can only see objects that reflect (反射) light waves. These waves enter the eye and are then processed by the brain. However, if an object doesn’t reflect light, then the waves don’t enter the eye, and the brain doesn’t process. So building an invisibility cloak is building something that doesn’t reflect light.

Cummer was part of a team of scientists from Duke University, including David Smith and David Schurig, who built the world’s first version (版本) of an invisibility cloak. They had been inspired by the work of a British physicist, John Pendry. He in May said that an invisibility cloak was possible and Pendry was not the only one thinking about a disappearing act. At the same time, a Scottish physicist, UIf Leonhardt published a paper on building invisibility equipment.

“It wasn’t easy,” says Cummer. “As often happens in science and research, it didn’t work very well the first time. That first cloak didn’t work like Harry Potter’s --- the scientists didn’t actually see anything disappear. So the research is still under way. ”

1.The first two paragraphs serve as a (n) ________.

A. introduction B. explanation

C. comment D. summary

2.Cummer and other scientists got the idea of building an invisibility cloak from _________.

A. the film Harry Potter

B. the work of a British physicist

C. a paper published by a Scottish physicist

D. the book of J.R.R. Tolkein

3. From the text we learn that the research on an invisibility cloak __________.

A. was led by Pendry

B. was very successful

C. was used in most popular movies

D. is still in progress

4.What can be the best title for the text?

A. The Science of Disappearing

B. The Hardest Part of Building a Cloak

C. The Invention of an Invisibility Cloak

D. Turn Science Fiction into Real Science

Johnny Smith was a good math student at a high school. He loved his computer. He came home early every day, and then he worked with it till midnight. But Johnny was not a good English student, not good at all. He got an F in his English class. One day after school Johnny joined his computer to the computer in his high school office. The school office computer had the grades of all the students: the math grades, the science grades, the grades in arts and music, and the grades in English. He found his English grade. An F! Johnny changed his English grade from an F to A. Johnny' parents looked at his report card. They were very happy.

"An A in English!" said Johnny's Dad. "You're a very clever boy, Johnny."

Johnny is a hacker(黑客). Hackers know how to take information from other computers and put new information in. Using a modem(调制调解器), they join their computers to other computers secretly. School headmasters and teachers are worried about hackers. So are the police, for some people even take money from bank computer account and put it into their own ones. And they never have to leave home to do it! They are called hackers.

1.Johnny changed his English grade with the computer in _______.

A. the classroom B. the school office

C. a bank near his house D. his own house

2.When Johnny's parents saw the report, they were happy because _______.

A. Johnny was good at math

B. Johnny loved computers

C. Johnny could join one computer to another

D. they thought Johnny was not poor in English any longer

3.Who are worried about hackers in the story?

A. Johnny's parents

B. School headmasters, teachers and the police

C. Only the police

D. Many school headmasters and teachers

4.What should the hackers know well, do you think, after you read this story?

A. Information B. Bank computer accounts

C. Computers D. Grades

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