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A recent survey shows that many students have got into some bad living habit£¬which do great harm to their health£®

As we all know it, health is more important than wealth£®Without a healthy body£¬you cannot do everything even if you are a millionaire£®In order keep healthy£¬it¡¯s necessary to get rid of unhealthy habits and form good ones£®

First of all£¬eat a healthy breakfast is a great way to start the day£®You should eat more fruit and vegetables£¬which are rich of vitamins£®Secondly£¬getting enough sleep£®Early to bed and early to rise make you feel great all day long£®Lastly£¬take exercise every day to make your body strong£®

As long as you form health habits and keep them£¬you¡¯ll have a strong body and live the healthy life£®

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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

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Dear editor,

Recently students of our school have made a survey of ¡°Views on Newspaper¡±. _____________________________

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¡¾ÌâÄ¿¡¿Do you drink water that's been left sitting out overnight or even for another day? Have you noticed it tastes different?

Tap water that has been left to sit out slowly begins to acquire an off taste. Many people think that this is because of microorganisms(΢ÉúÎï). But that's not what makes old water taste not fresh. For that we can thank carbon dioxide. After about 12 hours, tap water starts to go flat as carbon dioxide in the air starts to mix with the water in the glass, lowering its pH and giving it an off taste. But it's most likely safe to drink.

However, back to those microorganisms. If you use a dirty glass day after day, there is more of a chance of bacteria making themselves known; a risk that increases if you share the glass with another mouth as well. But assuming you use a fresh glass every few days, you probably won't have a problem unless the glass has been touched by dirty fingers, and especially if those dirty fingers went unwashed after using the bathroom.

As for plastic water bottles that have been left out in the sun or in the car, step away from the bottle, warns Dr. Kellogg Schwab, director of the Johns Hopkins University Water Institute. "A chemical called bisphenol-A, or BPA, along with other things used to make plastic can leach(¹ýÂË) into your water if the bottle heats up or sits in the sun," he explains. BPA, as you probably know, has been linked to everything from heart disease to cancer. Schwab also adds that plastic used for commercial bottled water isn't meant to be washed or refilled, so use only one time and recycle. Or don't buy them at all; use refillable water bottles instead.

¡¾1¡¿Tap water begin to acquire an off taste because of ________.

A. BPAB. the glassC. the microorganismD. carbon dioxide

¡¾2¡¿According to Paragragh 2, tap water that's been left sitting out for 12 hours ________.

A. tastes betterB. is still safe to drink

C. contains few microorganismsD. is most likely undrinkable

¡¾3¡¿What should we do with plastic water bottles that have been left out in the sun or in the car?

A. Throw them away.B. Refill them with fresh water.

C. Use them after they cool down.D. Clean them and use them again.

¡¾4¡¿Which of the following is true about BPA?

A. It is safe for people to use.

B. It is a kind of new material.

C. It can cause great harm to people.

D. It is the main material to make plastic.

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