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A survey basing on 1,000 students found that half of the pupils and 80% of the middle school students sleeps less than nine hours every night. Too many homework given by school teachers and parents is the main reasons. Another reason lies in students¡¯ bad habits. Some students, for example, are absent-minded while doing his homework, and some waste their after-class time. The third reason is because some students have to get up early on weekdays to get school far away from home. Experts are calling at schools and parents to cut down on the amount of homework but students should make a good use of their time. It would be better if they could choose to study in a nearby school.

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¡¾ÌâÄ¿¡¿Satellites play big roles in modern life. Some look downward to monitor environmental conditions on Earth.Others look outward in search of major solar flares(Ò«°ß) that can trouble the transmission(´«ËÍ) of electrical power to homes and businesses. Some spy on our enemies. Others relay communications around the globe. But all of these million-dollar wonders of technology can be knocked out by a collision with space junk ---debris (ËéƬ )from satellites and other earthly technology orbiting high above the planet. Now,a teen from Jordan has designed a satellite to chase down space junk , collect it and then deal with it.

Even bits of space junk as small as dots of paint pose a threat , says Dana. That's because this debris orbits our planet at speeds up to some 28,200 kilometers per hour. Such high speed explains why tiny paint dots have damaged the windshields of space shuttles so badly that they needed to be replaced.

Researchers have come up with many ideas for getting rid of space junk. Some have suggested vaporizing(Õô·¢) small bits with lasers. Others have proposed launching satellites to collect the debris. Dana's design falls into this category.

Here's how hers would work : A radar system aboard the satellite would scan and find a piece of space junk.Then,thrusters(ÍƽøÆ÷)would change the satellite's orbit so that it could chase down the errant object. As the satellite closed in on its prey, cameras would keep it on target.

At the last minute,a door that leads to a container would open. This container needs to be strong so that it doesn't break apart when the satellite swallows the space junk,Dana explains. Finally,when the trash container was full,it would be lowered toward the earth on a kilometer-long cable and its contents released into the upper atmosphere. There, the space junk would harmlessly burn up just like a meteor (Á÷ÐÇ) does. Meanwhile, her satellite would roll the container back up so that it could collect more trash.

¡¾1¡¿What is focused on in the first paragraph?

A. The types of satellites being categorized into.

B. The tracks of satellites orbiting above the planet.

C. The sources of space junk coming from.

D. The danger that satellites face in space.

¡¾2¡¿Why can small pieces of space junk threaten satellites?

A. They travel at a very high speed.

B. They are difficult to track by satellites.

C. They can blow up into millions of pieces.

D. They are as soft as a ball in the air.

¡¾3¡¿The underlined words "the errant object" refer to_____.

A. the radar system that scans space junk

B. the space junk that travels in disorder

C. the satellite that doesn't keep its track

D. the camera that can't keep space junk on target

¡¾4¡¿According to the Dana's design, space junk in her satellite___________.

A. will be swallowed and stored in its trash bin

B. will be broken apart in the trash container

C. will be destroyed by heat in the upper atmosphere

D. will be transported to the earth through a cable

¡¾ÌâÄ¿¡¿An environmental group called the Food Commission is unhappy and disappointed because of the sales of bottled water from Japan. The water, it angrily argues in public, has traveled 10,000 ¡°food miles¡± before it reached Western customers. Transporting water halfway across the world is surely the extremely stupid use of fuel when there is plenty of water in the UK. It is also worrying that we were wasting our fuel by buying prawns from Indonesia (7,000 food miles ) and carrots from South Africa (5,900 food miles).

Counting the number of miles traveled done by a product is a strange way of trying to tell the true situation of the environmental damage due to industry. Most food is transported around the world on container ships that are extremely energy efficient. It should be noticed that a ton of butter transported 25 miles in a truck to a farmers¡¯ market doesn¡¯t necessarily use less fuel on its journey than a similar product transported hundreds of miles by sea. Besides, the idea of ¡°food miles¡± ignores the amount of fuel used in the production. It is possible to cut down your food miles by buying tomatoes grown in Britain rather than those grown in Ghana. The difference is that the British ones will have been raised in heated greenhouse and the Ghanaian ones in the open sun.

What is the idea of ¡°food miles¡± does provide, however, is the chance to cut out Third World countries from First World food markets. The number of miles traveled by our food should, as I see it, be regarded as a sign of the success of the global trade system, not a sign of damage to the environment.

¡¾1¡¿The Food Commission is angry because it thinks that ________.

A. UK wastes a lot of money importing food products

B. some imported goods causes environmental damage

C. growing certain vegetables causes environmental damage

D. people wasted energy buying food from other countries

¡¾2¡¿The phrase ¡°food miles¡± in the passage refers to the distance ________.

A. that a food product travels to a market

B. that a food product travels from one market to another

C. between UK and other food producing countries

D. between a Third World country and a First World food market

¡¾3¡¿By comparing tomatoes raised in Britain and in Ghana, the author tries to explain that ________.

A. British tomatoes are healthier than Ghanaian ones

B. Ghanaian tomatoes taste better than tomatoes ones

C. cutting down food miles may not necessarily save fuel

D. protecting the environment may cost a lot of money

¡¾4¡¿From the passage we know that the author is most probably ________.

A. a supporter of free global trade

B. a member of a Food Commission

C. a supporter of First World food markets

D. a member of an energy development group

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