Imagine that the battery on your mobile phone has run out. You can't make any calls for help and no one can contact you. You are all alone--- well, not quite. Just reach into your pocket and take out 题目和参考答案——青夏教育精英家教网—

题目内容

Imagine that the battery on your mobile phone has run out. You can't make any calls for help and no one can contact you. You are all alone--- well, not quite. Just reach into your pocket and take out a piece of sugar. Put it into the battery, wait a minute and you are back on the phone.

Thanks to a couple of American scientists, this situation could become real. Swadesh Chaudhuri and Derek Lovely have invented the “bacteria battery”. This kind of battery gets its power from bacteria that eats sugar and turns it into electricity.

“This is a special organism (有机体),”Lovely said. “You can get enough electricity to power a cell phone battery for about four days from a spoonful of sugar.”

In the past, bacteria batteries have been expensive and not long-lasting. But this battery uses a more efficient bacterium that can turn 80 percent of sugar into electrical energy. This is 30 percent more than similar batteries can manage.

The bacteria battery could become as small as a household battery. It is also cheap and stable, because sugar can be taken from waste and crops.

But the sugar-to-electricity process is slow: it could take weeks for the bacteria to change a cup of sugar into electricity.And it produces “greenhouse” gases which pollute the environment.

The scientists understand there is a lot more work to be done. “It is still young,” said Lovely.

“Where we are now is where solar power was 20 or 30 years ago.”

He also believes the battery will be used in scientific equipment at the bottom of the ocean.

Other ideas include using sugar in the blood to run medical devices in the human body and taking sugar from animal waste to provide energy to power homes in rural areas.

1.What's the passage mainly about?

A.How to change sugar into electricity. B.A scientific invention of a new type of battery.

C.How to use the new bacteria battery. D.A new kind of mobile phone and its future.

2.Which of the following is NOT the advantage of the newly-developed battery?

A.Convenient. B.Stable. C.Inexpensive. D.Quick.

3.Which of the following are the scientists working on to improve the new battery?

A.Increase the bacteria. B.Solve the pollution problem.

C.Bring down the price. D.Change the size of the battery.

4.What does the underlined sentence actually mean?

A.The bacteria battery shares some similarities with solar energy.

B.Scientists will continue their work until they find solar power.

C.There is still much room for the improvement of the bacteria battery.

D.The bacteria battery will be as popular as solar power in twenty or thirty years.

5.According to the last paragraph, who will find the bacteria battery less useful?

A.Divers. B.Farmers. C.Doctors. D.Architects.

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Sand is a common sight in the world. But you might not know that sand is also a useful resource (资源).

Sand is the second most-used resource in the world after water, the BBC reported. However, the UN said that sand is not limitless and that we might be running out of it.

Sand is made up of very small pieces of rock, soil and minerals (矿物质). It can take tens of thousands of years to form.

But now we are using sand more quickly than it is being formed. According to the BBC, we use about 15 billion tons of sand every year to build houses, roads and other things.

People also put sand in the sea to make new islands. Singapore, for example, is now 20 percent bigger than it was in 1965. Palm islands are three large man-made islands in Dubai, United Arab Emirates. They took 94 million cubic meters of sand to build.

If people keep using this much sand, it will run out in many places. For example, Vietnam may run out of construction (建造) sand by 2020, Live Science noted.

Since people need so much sand, they are trying to mine (开采) more of it. But this is bad for the environment. Mining sand may cause beaches to disappear and more floods to happen in places close to the sea. Also, this may affect the habitats (栖息地) of many plants and animals.

1.What does the story tell us about sand?

A.It can only be found on beaches. B.It is the most-used resource in the world.

C.It can never be used up. D.It can be used to build houses.

2.According to the passage, which country is using sand to build islands?

A.Singapore and Vietnam. B.Singapore and United Arab Emirates.

C.Britain and America. D.United Arab Emirates and Vietnam.

3.Every year, we use about________tons of sand.

A.94 million B.20 billion C.20 million D.15 billion

4.We are running out of sand because________.

A.there is only a little sand in the world B.we are using sand too quickly

C.we cannot mine enough sand D.our environment is badly polluted

5.In places close to the sea, more floods will happen because of________.

A.overmining of sand B.climate change

C.the increasing size of certain islands D.the death of some plants

—What's wrong with Mary?

—She's_______ at her sister's bad behavior.

A.crazy B.nervous C.excited D.mad

— Mary, do you know _________?

— Oh, he is a doctor. I once went to him to fix my teeth.

A.where John is from B.how John is doing

C.who John is D.what John is

English is considered as useful language, so more and more people try to learn it well.

A.a B.an C.the D.不填

阅读下面六个选项（A、B、C、D、E和F），选出符合各自需求的最佳选项。选项中有一个是多余选项。

1.Carter’s daughter is about five years old. She has her own room. Carter wants to paint her room pink because the little girl likes pink. Meanwhile their house needs new wallpaper. Carter wants some professionals to help with the job.

2.The Millers move into a small house which has a history of 30 years. They are pleased with the environment but not the electrical work. They have a lot of household appliances(家用电器) which require good electrical support. They need help.

3.Mrs. Hill finds there is something wrong with her shower room. Each time she takes a shower, a lot of water spreads out of the shower room into the living room. She has to find someone to fix the shower room.

4.Andrew, a carpenter has a customer who wants to make some furniture for his new house. Andrew can help him, but he needs some wood first.

5.Edward is considering paving the driveway. He wants to know how he can get some stones.

A.We are one of the most famous stone factories. We have specialized in stone for many years, and we have many kinds of stones used widely in building, landscape, etc. All in high quality, filling at the price!

B.Experienced builder and decorator- interior and exterior painting, plastering, wallpapering, flooring carpet fitting tiling. Call for free quotation(报价单) and unbeatable prices, 13236467211/07834224451.

C.Building ＆window designs for electrical work -- All electrical work undertaken include rewiring, power upgrades, fault finding, emergencies, extra sockets(插座), door entry systems, interior and exterior lighting. Twenty four hours call out 48303560.

D.EX kitchen offers complete and professional service, all leading brands are available; all associated building works are undertaken 07092424744.

E.Building/Repair. From shelves to shower rooms, from fitting kitchens/bathrooms to painting and paperhanging 20-year experience. Friendly prompt and reliable, qualified 019035334477.

F.Wood! Wood! Wood! At Bristol Wood Recycling Project. Wide selection, always changing, bargain prices. Hard, soft, flooring ＆dimensioned wood. Cutting sanding (砂纸打磨)＆delivery service. Tel:01179723219. Open Mon-Fri.

根据短文内容所给提示，在文中的横线上填写一个正确的单词。

When I was tidying up my room yesterday, I found an old box of my father's. He gave it1. me two years ago. It was2.(real) interesting to discover something about my father's life as a child. He once told me about his hobbies as a child. He 3. (write) to people from all over the world, and they sent him letters back. As a result, he had 4. book of stamps. From these s5., he learned a lot a6. famous people and history. People also gave him things from different 7. (country), such as a silk fan from China, a little model car from Germany 8.a small model ship from Australia. My father even kept the tickets from his 9.(one) football match. The box made me think about 10.(I) hobby. I want to keep my old picture books and magazines for a long time , too.

学校将举办英语写作比赛，请根据所给提示，以“My life in 20 years”为题，写一篇短文，分享你对未来的憧憬。

注意事项：

1．词数: 100词左右(文章开头已给出，不计入总词数)；

2．文中不能出现真实姓名、校名等信息；

3．文章必须包含所提供的主要信息，并作适当发挥。

My life in 20 years

I’m always working hard for a bright future I imagine

There is________ “s”in the-word“six”and________ “s’’is the first letter of the word.

A.a; the B.a;an C.an; the D.a;a

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