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Recently I found a donation box in my neighborhood. People come to them when they have old clothes, bags, newspapers and books donate. This box, I think, was of great significance. My mother buys for me a lot of clothes, and I grow so fast. Much clothes don¡¯t fit for me any longer. I¡¯ve got no ideas about how to deal with the clothes which are real new and still in good condition. However, with this donation box, I can help those people in need. In a word, I do think it is a good idea what lights up our life and makes the world the better place to live in.

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¡¾ÌâÄ¿¡¿ A cell phone is one of the few things that we hold close to our faces all the time, and yet it could possibly explode ¨C this is what made the recent Samsung¡¯s Galaxy Note 7 smart phone accidents so shocking.

According to technology news website, The Verge, flawed (ÓÐ覴õÄ) phone batteries might be to blame.

Even if you are not a science student, you probably know that it is common sense that the negative end and the positive end of the battery should never touch. If they do, the battery will short-circuit (¶Ì·), causing a powerful electrical reaction that can destroy the battery and cause a fire.

This is why all lithium-ion (ï®Àë×Ó) batteries ¨C the kind that can be found in many of our devices (µç×ÓÉ豸) like tablets and cameras ¨C have a separator layer inside to stop the two ends from touching one another.

But somehow, the separators in some of the Samsung phones broke, causing explosions.

Overcharging is another problem that can make batteries heat up quickly. Fortunately, most batteries are designed to be able to automatically stop charging once they are fully charged. But again, this somehow failed to happen in some of the Samsung phones.

According to Lynden Archer, a materials scientist at Cornell University, US, we have already achieved 90 percent of the battery life possible from a lithium-ion battery. Customers¡¯ demands that their devices get thinner and their battery have a longer life have given producers little choice but to try to put more power into thinner batteries. However, the more energy you put into a box, the more dangerous it¡¯s going to be.

¡¾1¡¿A separator layer is put in lithium-ion batteries in order to ______.

A.ensure a longer battery life

B.reduce a certain electrical reaction

C.connect the anode and the cathode

D.prevent a battery from short circuiting

¡¾2¡¿What are the possible reasons for the Samsung phone explosions?

A.Pushing the limits of batteries.

B.Short circuiting and overheating.

C.Overcharging and thinner batteries.

D.Automatic charging and broken separators.

¡¾3¡¿What is the writer¡¯s main purpose of writing the article?

A.To describe problems facing cell phone producers.

B.To warn us about the dangers of lithium-ion batteries.

C.To teach us common sense when it comes to batteries.

D.To explain the reasons for the Samsung phone explosions.

¡¾ÌâÄ¿¡¿ China will follow up on its successful mission (ÈÎÎñ) to the far side of the moon by sending a probe to Mars next year, one of its top space scientists said Sunday. Wu Weiren, chief designer of China¡¯s lunar exploration program, said the red planet was the natural next step. ¡°Next year we¡¯ll launch a Mars probe to orbit around the Mars, land on it and probe it,¡± he said. China will also send another probe to take back samples from the moon¡¯s surface.

Wu¡¯s comments came as a Mars simulation(Ä£Äâ) base opened in Qinghai¡¯s Qaidam Basin. According to the state-run Global Times, while the red rocky area bears a strikingly similarity to Mars, it¡¯s extremely difficult to simulate Mars due to its special natural features and hostile environment¡ªlow air pressure, strong radiation and frequent sandstorms, as well as vast differences in geography.

China didn¡¯t send its first satellite into orbit until 1970, by which time America had already landed an astronaut on the moon, but it¡¯s been catching up fast. Since 2003, China has sent six crews into space and two space labs into Earth¡¯s orbit In 2013, China successfully landed a rover, Yutu 1, on the moon, becoming only the third country to do so.

Last December, China landed another probe and a rover, Yutu 2, on the far side of the moon. Progress has been slow going since then: due to the extreme conditions there, the rover often has to hibernate to preserve its capabilities for further exploration, Wu said. ¡°The temperature there is minus 190 degrees Celsius, which all components and parts cannot stand. So we let it sleep for a while, making sure it can spend the night safely. A few days ago, it woke up automatically to work. We¡¯ve gained lots of data in the past few days, and we're going to make the data known to the world,¡± Wu said.

¡¾1¡¿What¡¯s China¡¯s next step in its space exploration?

A.To get back a probe from Mars.

B.To probe Mars next year.

C.To land a rover on Mars successfully.

D.To open a Mars simulation base.

¡¾2¡¿Which does the underlined word ¡°hostile¡± in Paragraph 2 probably mean?

A.Stable.B.Uncertain.

C.Unfavorable.D.Friendly.

¡¾3¡¿What can be learned from the last paragraph?

A.Yutu 2 often has to hibernate to save its energy.

B.The data from Yutu 2 is accessible to the world.

C.Progress has been steady in the past exploration.

D.Yutu 2 can survive the moon's extreme conditions.

¡¾4¡¿Which of the following has China achieved in exploring space?

A.Two space labs have been set up.

B.Six crews were sent into space in 2003.

C.Samples from the moon have been taken back.

D.China became the third to send a satellite to Earth¡¯s orbit.

¡¾ÌâÄ¿¡¿ The world can sometimes seem like a dangerous place, especially at night.¡¾1¡¿ For example, here are some tips that can stay safe at night.

You need to be well aware (Òâʶµ½µÄ) of your surroundings. To achieve this, don¡¯t talk on the phone or listen to music.¡¾2¡¿If there is a drunk who is walking down the street, notice him and cross the street or choose a different way.

Wear brightly colored clothing.¡¾3¡¿ For example, brightly colored clothing helps reduce the danger from cars because you can be seen easily. Also bright colors have a lot to do with confidence and though it will not protect you every time, it can make someone who was going to disturb you, less likely to do so.

Make sure that someone knows where you will go. For example, if you have to walk somewhere at night, make sure that a friend or a person who you trust knows the way that you will take.¡¾4¡¿

You need to remember some phone numbers in case you lose your cell phone, or it can¡¯t be used. So, along with the obvious emergency numbers (½ô¼±ºÅÂë), you should have a friend or two that you can call if you run into difficulty. If you can, try and have these numbers of people who live next to your house. ¡¾5¡¿And as a result she may not be able to help you at all.

A.Bright colors help you out in different ways.

B.Try and always have money for transportation.

C.Instead, pay attention to the people round you.

D.Learn to ask for help when you are in trouble.

E.While you may call mom for help, she might live thousands of miles away.

F.Luckily you can do something to stay away from possible dangers.

G.If something does happen to you, they know where to start looking for you.

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Good morning, everyone,

I¡¯m Li Hua from Xing Guan Middle school. The topic of my speech is ¡°Let¡¯s ride bicycles.¡±

As known to all, with the improvement of people¡¯s living standards, cars have become a popular means of transport, bring great convenience to our life. But, they have also caused some problem such as air pollution or traffic jams.

How can we solve the problems then? As far as I am concern, ride bicycles is a good solution. For first thing, bicycles don¡¯t need any petrol and they are energy ¨Csaving. For another , bicycles are environmental friendly because they won¡¯t give off waste gas .What¡¯s more , it is a good way for us to exercise and it is beneficial to our healthy .

Therefore, let¡¯s take on the responsibility to build up a low-carbon city by riding bicycles. Come on and join us!

Thank you!

Î¥·¨ºÍ²»Á¼ÐÅÏ¢¾Ù±¨µç»°£º027-86699610 ¾Ù±¨ÓÊÏ䣺58377363@163.com

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