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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.
八年级英语阅读单选困难题查看答案及解析
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David thought his mobile phone was broken _____ his sister pointed out that he didn't turn it on.
A. until B. unless C. after
八年级英语单选题中等难度题查看答案及解析
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Is your mobile phone just to make phone calls? If yes, you are out of date then. The very recent fashion ---Apple iphone has started a new _______ for mobile phones and developed more and more uses. Its touch-to-go function(功能) and shining design make the iphone one of young people’s favorite toys. They take notes, enjoy music, surf the web with it and it can also be used as a picture, video and voice recorder. The iphone is like a mini-computer and can provide all the entertainment that you need.
A U.S university has found a new use for the Apple iphone ---as a musical instrument. Professors from the University of Michigan have worked together in the past five months to create what they call a 21st century orchestra. There are no traditional instruments, only 20 of Apple’s best selling mobile phones. This mobile phone group can play different parts together, such as the piano, the trumpet, the violin and the saxophone(萨克斯). They wrote programs to let users experiment with the iphone’s technologies themselves. With their programs, the iphone users can change their iphones into electronic musicians that can play the wanted music.
It is said that the first CD recorded by the iphone orchestra will soon go to the market. Still waiting? Act now and own your personal orchestra!
1. Which of the following may be the best word to put in _______in the passage?
A. plan B. journey C. chance D. life
2.Which of the following best describes Apple iphone’s functions?
A.A toy most favored by the young people.
B.Its touch-to-go function and shining design.
C.An orchestra that doesn’t need a piano, a violin or a saxophone.
D.A mini entertaining computer and a picture, video and voice recorder.
3.In this passage, the writer tries to encourage(鼓励) people to ________.
A. learn more about fashion
B. write programs for mobile phones.
C. own a personal iphone.
D. enjoy music from the orchestra.
4.What’s the best title for the passage?
A. IPhone ---Young People’s New Fashion
B. Iphone Has a New Use
C. How to Be an Electronic Musician
D. Buy an Iphone Now
八年级英语阅读理解中等难度题查看答案及解析
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Did you ever count the number of digits (数字) in your mobile phone number? Your number has 11 digits. You may sometimes find it hard to remember your number. That’s because China has the longest mobile phone numbers in the world. Why is that?
We can group the 11 digits into three parts. Each part has a different meaning. The first three numbers tell you which mobile phone service company you are using. For example, 135 is for the China Mobile Communications Corporation (中国移动) and 188 is for China Unicom (中国联通). The fourth to the seventh digits tell you where the number is registered (注册).For example, 0731 shows it is registered in Changsha, and 0733 shows it is registered in Zhuzhou. And the last four digits are random (随机的).
The main reason for using 11 digits is that we have the most people in the world. We once had 10 numbers. But as people grew more and more, there were not enough numbers for us to use. So we began to use 11 digits starting from 1999.
We can use eleven digits to make uncountable mobile phone numbers. That’s enough for each person to have seven or eight phone numbers to use in China.
What’s more, we can recycle mobile phone numbers. Usually, if someone doesn’t use the number any more, the service company will reuse the number after three to six months. If you didn’t call a number for a long time, you may find that the owner already changed.
Like China, Britain and Japan also use 11-digit mobile phone numbers. But their numbers always start with 0. So they cannot create as many numbers as we can. Countries like the United States, Australia and India use phone numbers with 10 digits. Canada’s mobile phone numbers are probably the world’s shortest: they use seven digits.
1.When you see the phone number 13507336688 in China, you may get the following information EXCEPT （除了） .
A.the service company is China Mobile Communications Corporation
B.the last four digits 6688 tell us where the phone number comes from
C.the phone number is registered in Hunan
2.China has the longest mobile phone number mostly because .
A.it is easy to group B.it has the most users in the world C.it makes difference with other countries
3.The underlined word in paragraph 5 means .
A.循环利用 B.再次购买 C.彻底丢弃
4.Which statement is NOT TRUE according to the passage?
A.Canada uses 7-digit mobile phone numbers.
B.Japan can create as many numbers as China with 11 digits.
C.We didn't use the 11-digit mobile phone number until 1999.
5.What is the best title for the passage?
A.Mobile Phone Companies B.Different Meanings of Digits C.Longest Mobile Phone Numbers
八年级英语阅读单选困难题查看答案及解析
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— Do you like talking with your friends on the telephone or mobile phone?
— . I enjoy chatting online.
A. Neither B. Either C. None
八年级英语单项填空中等难度题查看答案及解析
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— Do you like talking with your friends on the telephone or mobile phone?
— . I enjoy chatting online.
A.Neither B. Either
C. Both D. None
八年级英语单项填空中等难度题查看答案及解析
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— Do you like talking with your friends on the telephone or mobile phone?
— . I enjoy chatting online.
A. Neither B. Either C. Both D. None
八年级英语单项填空中等难度题查看答案及解析
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— Do you like talking with your friends on the telephone or mobile phone?
— . I enjoy chatting online.
A. Neither B. Either
C. Both D. None
八年级英语单项填空中等难度题查看答案及解析
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— Do you like talking with your friends on the telephone or mobile phone?
— . I enjoy chatting online.
A. Neither B. Either
C. Both D. None
八年级英语单项填空中等难度题查看答案及解析
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The mobile phone is like your ID card nowadays .It’s the first thing that you will look for when you get up .It’s a must carry thing wherever you go (even washrooms ).That’s why marketers are aiming at (针对)mobile users a lot .They know what the future is going to be and how the things are going to change after some time .According to some perdition, mobile Internet use will overtake computer Internet use before 2015.
Here is some interesting information about mobile use.
How fast is mobile Internet growing?
By 2014, mobile Internet should take over computer Internet use .It is predicted that mobile Internet users will be much more than computer Internet users.
How much do people use their mobile phones?
On average, Americans spend 2.7 hours per day on their mobile phones .That’s over twice the amount of time they spend eating and over 1/3 of the time they spend sleeping each day.
What do people use their mobile phones for?
Games 61﹪ Weather 55﹪ Maps /search 50﹪ Social Networking 49﹪
Music 42﹪ News 36﹪ Entertainment 33﹪ Dining 25﹪ Video 21﹪
1.According to the passage ,the first thing you look for is when you get up.
A. computers B. televisions C. mobiles D. Internets
2.The underlined word “overtake “means “ ”in Paragraph 1.
A. 超过 B.改变 C．提高 D.消灭
3.According to the passage ,people use their mobile phones most for .
A. reading news B. playing games
C. enjoying music D. watching videos
4.Marketers aim at mobile users a lot because .
A. Mobile users are very rich
B. Mobiles are rather popular in people’s life now
C. Mobiles are very useful and expensive
D. Mobile users have their ID card in their mobiles
5.This passage mainly tells us about .
A. some interesting information about mobile use
B. how many people are using mobile phones?
C. what kind of mobile phones are being used by people
D. what people use their mobile phone for
八年级英语阅读理解困难题查看答案及解析