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All the useful energy at the surface of the earth comes from the activity of the sun. The sun heats and feeds creatures and mankind. Each year it provides men with two hundred million tons of grain and nearly ten million tons of wood.

Coal, oil, natural gas, and all other fuels are stored energy from the sun. Some was collected by this season's plants as carbon compounds. Some was stored by plants and trees ages ago. Even waterpower derives from the sun. Water turned into vapor by the sun falls as rain. It courses down the mountains and is converted to electric power. Light transmits only the energy that comes from the sun's outer layer, and much of this energy that is directed towards the earth never arrives. About nine tenths of it is absorbed by the atmosphere of the earth. In fact, the earth itself gets only one half millionth of the sun's entire output of radiant energy.

The sun is the source of all of the following EXCEPT______.

A.gasoline

B.natural gas

C.atomic power

D.animal fat

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更多“All the useful energy at…”相关的问题
第1题
German chemicals giant BASF saves ?200 million a year by ______.A.recycling heat and energ
German chemicals giant BASF saves ?200 million a year by ______.
A.recycling heat and energy
B.setting up factories in China
C.using the newest technology
D.reducing the CO2 emissions of its plants
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第2题
SMALL TALK BEFORE A MEETING This is a situation you’ve probably experienced many times: you arrive for a meeting ten minutes early. There are several people already there. You say hello and then … What do you talk about What do you say In this situation, you need to be able to make small talk. Small talk is an informal conversation. We use the term “small talk” because it is not about exchanging information or making decisions or having a serious discussion. It’s a way to avoid uncomfortable silences and build stronger relationships. Small talk might seem to be about nothing important, but it is important in itself. Being able to make small talk will allow you to make yourself part of a group. It will set the stage for more serious types of communication.
1.Small talk is a kind of formal dialog.()
2.The term “small talk” means there are only two persons in the dialog.()
3.Small talk is a useful ice-breaker and can build stronger relationships.()
4.Small talk is not at all important. ()
5.Making small talk will allow you to be a member of a group.()

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第3题
We live in a computer age. People ___21___ scientists, teachers, writers and even students use computers to do all kinds of work. But more than 30 years ago, computers couldn't do much. They were very big and expensive. Very ___22___ people were interested in them and knew how to use them. Today computers are smaller and ___23___. But they can do a lot of work, many people like to use them. Some people even have them at home.
Computers become very important because they can work faster than people and make fewer mistakes. Computers can ___24___ people do a lot of work. Writers now use computers to write. Teachers use them to help teaching. Students use them to study. Computers can also remember what you ___25___ them. Computers are very useful and helpful. They are our friends. Do you want to have a computer?
21)、
A.like
B.cheaper
C.few
D.put into
E.help
22)、
A.like
B.cheaper
C.few
D.put into
E.help
23)、
A.like
B.cheaper
C.few
D.put into
E.help
24)、
A.like
B.cheaper
C.few
D.put into
E.help
25)、
A.like
B.cheaper
C.few
D.put into
E.help
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第4题
Learning English for 2008 Beijing OlympicsYang Zhenhua has been a taxi driver for years
Learning English for 2008 Beijing Olympics
Yang Zhenhua has been a taxi driver for years. He knows every corner of the city. His work usually wins him thanks except when he meets foreigners, for Yang doesn't know any English.
"Now I study English in my free time," said Yang in his 40s. He pulls an English textbook from the toolbox. "I study English to help with Beijing Olympics," he said proudly. Yang is just one of the millions of common people in Beijing who started to learn English when Beijing became the host city of the 2008 Olympic Games. Learning and speaking is hot among the people of this 3,000-year-old city. From schools to factories, men and women, old and young are studying their "ABC". Books teaching useful expressions for everyday communication(交际) are the most popular.
Some people, such as taxi drivers, bus conductors and the policemen, are asked to learn basic English. Nearly 3,000 students from 50 universities in Beijing went to the streets last August as volunteers to teach English to the people of this city. They taught common and useful sentences, such as greetings and asking and answering simple questions. Official figures show that about 15% of Beijing citizens can speak English. It is said that it will rise to 70% or 80% during the following years. Besides, the government encourages the use of English in many places. The city underground railways give messages by radio in both English and Chinese. English, not Chinese, is used as the most important working language for the Olympic Committee(委员会). Nearly all the committee members can speak English freely. Many are good at the language.
1)、Yang Zhenhua can hardly win himself thanks from foreigners because he is a common taxi driver.
A.T
B.F
2)、According to the passage, the English beginners in Beijing like to learn English news best.
A.T
B.F
3)、Nearly 3,000 students from 50 universities in Beijing went to the streets last August to tell people the importance of English.
A.T
B.F
4)、Beijing citizens are encouraged to use as much English as possible.
A.T
B.F
5)、The passage is about more and more people are learning English in Beijing.
A.T
B.F
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第5题
Radiocarbon DatingNowadays scientists can answer many questions about the past through a t
Radiocarbon Dating
Nowadays scientists can answer many questions about the past through a technique called radiocarbon(放射性碳), or carbon-14, dating. One key to understanding how and why something happened is to discover when it happened.
Radiocarbon dating was developed in the late 1940s by physicist Willard F. Libby at the University of Chicago. An atom of ordinary carbon, called carbon-12, has six protons(质子) and six neutrons(中子) in its nucleus. Carbon-14, or C-14, is a radioactive, unstable form. of carbon that has two extra neutrons(原子核). It returns to a more stable form. of carbon through a process called decay(衰减). This process involves the loss of the extra neutrons and energy from the nucleus.
In Libby's radiocarbon dating technique, the weak radioactive emissions(放射) from this decay process are counted by instruments such as a radiation detector and counter. The decay rate is used to determine the proportion of C-14 atoms in the sample being dated.
Carbon-14 is produced in the Earth's atmosphere when nitrogen(氮)-14, or N-14, interacts with cosmic rays(宇宙射线). Scientists believe since the Earth was formed, the amount of nitrogen in the atmosphere has remained constant. Consequently, C-14 formation is thought to occur at a constant rate. Now ratio of C-14 to other carbon atoms in the atmosphere is known. Most scientists agree that this ratio is useful for dating items back to at least 50,000 years.
All life on Earth is made of organic molecules(分子) that contain carbon atoms coming from the atmosphere. So all living things have about the same ratio of C-14 atoms to other carbon atoms in their tissues(组织). Once an organism(有机体) dies it stops taking in carbon in any form, and the C-14 already present begins to decay. Over time the amount of C-14 in the material decreases, and the ratio of C-14 to other carbon atoms goes down. In terms of radiocarbon dating, the fewer C-14 atoms in a sample, the older that sample is.
Nowadays many scientists depend on radiocarbon for dating age-old objects.
A.Right
B.Wrong
C.Not mentioned

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第6题
Advertisement can be thought of "as the means of making known in order to buy or sell goods or services". Advertisement aims to increase people's awareness and arouse interest. It tries to inform. and to persuade. The media are all used to spread the message. The press offers a fairly cheap method, and magazines are used to reach special sections of the market. The cinema and commercial radio are useful for local market. Television, although more expensive, can be very effective. Public notices are fairly cheap and more permanent in their power of attraction. (78) Other ways of in creasing consumer interest are through exhibitions and trade fairs as well as direct mail advertisement.
(79) There can be no doubt that the growth in advertisement is one of the most striking features of the western world in this century. Many businesses such as those handling frozen foods, liquor, tobacco and medicines have been built up largely by advertisement. We might ask whether the cost of advertisement is paid for by the producer or by the customer. Since advertisement forms part of the cost of production, which has to be covered by the selling price, it is clear that it is the customer who pays for the advertisement. How ever, if large—scale advertisement leads to increased demand, production costs are reduced, and the customer pays less.
It is difficult to measure exactly the influence of advertisement on sales. When the market is growing, advertisement helps to in crease demand. When the market is shrinking, advertisement may prevent a bigger fall in sales than would occur without its support. (80) What is clear is that businesses would not pay large sums for advertisement if they were not convinced of its value to them.
Advertisement is often used to ______.
A.deceive customers
B.increase production
C.arouse suspicion
D.push the sale

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第7题
英语是多么有用的一门学科()

A、What a useful subject English is

B、What a useful subject English it is

C、How useful English is

D、How useful English subject is

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第8题
One of the things I am really fond of is the weekly shopping experience. I like toimag
One of the things I am really fond of is the weekly shopping experience. I like to
imagine pushing the trolley slowly around the supermarket and taking anything that
interests me. But my experience is not always so exciting. First it is difficult to get
a shopping trolley. Carefully designed not only to hold all shapes and sizes of
purchases, a single trolley is hard to get out of the line of trolley s where it is
parked. Often one needs the help of two strong men. The next lesson is that women never
follow a logical route when shopping. Your wife has disappeared before you know it.
After ten minutes of searching, when you finally find her in a far corner, she
enquires: “Where have you been all this time, dear?” Supermarket managers are sent on
courses to learn how to tempt the customers and persuade them to buy goods they do not
really need, at prices they are not able afford. As a newcomer, I am often taken in by
their clever techniques, as I take many goods off the shelves. But I am often
discouraged by my wife. “Put it back, dear.” “You’ve tried that before and didn’t
take to it.” “No, it’s too expensive.” After the week’s groceries have been
collected, the last trial is passing through the checkout counter. Never join the
shortest queue. It usually contains several shoppers who pay by writing out a personal
cheque and who wait until all their purchases have been totaled up before beginning a
mad search through their handbags for their cheque books. When the book is found, the
customer never knows the date, asks again for the forgotten total and forgets to put
the address on the back. Don’t be fooled, either, by thinking that this is the end of
the exercise. When the cheque has been carefully examined by the cashier, a bell rings
, and there is a further wait until a supervisor arrives to say that the cheque can be
accepted. Then it is our turn, and the checkout girl is so quick and efficient that we
don’t have time to get our own chequebook ready. But the people who are packing our
shopping are kind and give us friendly smiles When we come once more into the great
outside world, a broken egg is running down my trousers. I hear the voice of my wife
call out: “Oops, dear, mind the trolley.” Shopping!
1. How often does the author go shopping?
A. every day
B. every week
C. every month
D. every year
2. The author does not find his shopping experience always ______.
A. exciting
B. useful
C. embarrassing
D. time-consuming
3.The last trial is ____________________________.
A. collecting groceries
B. passing through the checkout counter
C. having a rest
D. saying goodbye
4. Who comes to check whether the cheque can be accepted.
A. The supervisor
B. The manager
C. The salesgirl
D. The husband
5. When they come into the great outside world, the author finds that ______.
A. he can’t find the car
B. he can’t find his wife
C. a ten-dollar note on the ground
D. a broken egg is running down his trousers

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第9题
提议;建议()

A、clothes

B、suggestion

C、useful

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第10题
Writing a comment after each lesson is a useful habit for a teacher to get into.()
Writing a comment after each lesson is a useful habit for a teacher to get into.()
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第11题
useful()

A、更好的

B、寂静;无声

C、有用的

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