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（请给出正确答案）
1) analyze the chart, and
2) give your comments on the trend.
In your essay, make full use of the information provided in the pictures printed below.
You should write about 160-200 words neatly on ANSWER SHEET 2.
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答案
更多“Cell phones are now essential to millions of people as a convenient form. of communication”相关的问题
第1题
Cell Phones
1．Believe it or not，cell phones have been around for over a quarter of a century．The first commercial cell phone system was developed by the Japanese in 1979，but cell phones have changed a lot since that time．The early cell phones were big and heavy but they have developed into small and light palm sized models．There have been huge developments in their functions，too：we have had call forwarding，text messaging，answering services and hands-free use for years，but now there are countless new facilities，such as instant access to the Internet and receiving and sending photos．
2．Cell phones have become very common in our lives：recent statistics suggest as many as one in three people on the planet now have a cell phone，and most of them say they couldn&39;t live without one． Cell phones are used in every area of our lives and have become a necessary tool，used for essential arrangements，social contact and business．They have made it easier to call for help on the highway．They have made it possible to keep in touch with people“on the move”-when people are traveling．
3．Cell phones have made communication easier and have reduced the need for family arguments!We can use cell phones to let our family know we&39;ll be late or if there&39;s a sudden change of plan or an emergency．Cell phones have eased the worries of millions of parents when their teenagers are out late：they can now contact their children at any time．
4．This does not mean that cell phones are all good news．They have brought with them a number of new headaches for their owners：it costs a lot to replace stolen phones，something that is becoming a frequent occurrence，and have you ever seen such huge phone bills？More serious，however，is the potential health problem they bring：there are fears that radiation from the phones may cause brain tumor(肿瘤)． This may be a time bomb waiting to happen to younger people who have grown up with cell phones that they simply can&39;t live without!
Paragraph 1______
A．Cell phones and the family B．Commercial cell phone systems C．Cell phones in everyday life D．Cell phones for teenagers E．History of cell phones F．Problems with cell phones
Paragraph 2______
A．Cell phones and the family B．Commercial cell phone systems C．Cell phones in everyday life D．Cell phones for teenagers E．History of cell phones F．Problems with cell phones
Paragraph 3______
A．Cell phones and the family B．Commercial cell phone systems C．Cell phones in everyday life D．Cell phones for teenagers E．History of cell phones F．Problems with cell phones
Paragraph 4______
A．Cell phones and the family B．Commercial cell phone systems C．Cell phones in everyday life D．Cell phones for teenagers E．History of cell phones F．Problems with cell phones
Nowadays cell phones are equipped with______．
A．a necessity B．an emergency C．a number of new headaches D．family arguments E．big and light palm-sized models F．countless new facilities
Cell phones are common in our lives and have become______．
A．a necessity B．an emergency C．a number of new headaches D．family arguments E．big and light palm-sized models F．countless new facilities
We can use cell phones to communicate with othors when we encounter______．
A．a necessity B．an emergency C．a number of new headaches D．family arguments E．big and light palm-sized models F．countless new facilities
In spite of many benefits，cell phones have brought for their owners______．
A．a necessity B．an emergency C．a number of new headaches D．family arguments E．big and light palm-sized models F．countless new facilities
请帮忙给出每个问题的正确答案和分析，谢谢！
第2题
Part B
Cell phones are very popular now; even the primary school students hold one everyday. What do you think of its advantages and disadvantages？ Write an essay of about 120 words to state your opinions.
第3题
cancer. originally,because of a lawsuit that alleged such a link Network news programs ran their own tests of cell phones,reporting to the public that some cell phones exceed the maximum level of emitted radio frequency energy allowed by the US Federal Communications Commission.
In 2000.it was estimated that there were 92 million cell phone users in the United States and this number was growing by 1 million every month. More recently,the Cellar Telecommunications & Internet Association estimated that there were almost 170 million US cell phone users, and the seriousness of brain tumours, this is clearly a topic of wide concern.This report summarizes what we now know about the carcinogenicity of using cell phones.
Cell phones operate with radio frequencies.a form. of energy located on the electromagnetic spectrum between F M radio waves and the waves used in microwave ovens,radar;and satellite stations.Cell phones do not emit ionizing radiation,the type that damages DNA and is known to have the ability to cause cancer.
Cell phone technology works on a system of geographically separated zones called "cells" Each cell has its own "base station" that both receives and emits radio waves.When a call is placed from a cell phone,a signal is sent from the cell phone antenna to that cell's base station antenna.The base station responds to the cell phone signal by assigning the phone an available RF channel.When the RF channel is assigned,radio signals are simultaneously received and transmitted, allowing voice information to be carried between the cell phone and the base.The base station transfers the call to a switching centre.where the call can be transferred to a local telephone carrier or another cell phone.
6.There has existed argument about the link between cell phone and brain tumour.()
7.The rapid growing number of cell phone users has been a great concern in the US.()
8.The 3rd paragraph tries to prove that cell phones do not cause brain cancer.()
9.A switching centre is needed when we make a call through cell phone.()
10.The topic of the passage is about cell phone and cancer.()
第4题
第二篇 Cell Phones : Hang Up or Keep Talking？
Millions of people are usingcell phones today. In many places it is actually considered unusual not to useone. In many countries, cell phones are very popular with young people. Theyfind that the phones are more than a means of communication-having a mobilephone shows that they are cool and connected.
The explosions around theworld in mobile phone use make some health professionals worried. Some doctorsare concerned that in the future many people may suffer health problems fromthe use of mobile phones. InEngland.there has been a serious debate about this issue. Mobile phone companies areworried about the negative publicity of such ideas. They say that there is noproof that mobile phones are bad for your health.
On the other hand, why dosome medical studies show changes in the brain cells of some people who usemobile phones？ Signs of change in the tissues of the brain and head can bedetected with modern scanning(扫描) equipment. In one case, atraveling salesman had to retire at a young age because of serious memoryloss.He couldn't remember even simple tasks. He would often forget the name ofhis own son. This man used to talk on his mobile phone for about six hours aday,every day of his working week,for a couple of years. His family doctorblamed his mobile phone use,but his employer's doctor didn't agree.
What is it that makes mobilephones potentially harmful？ The answer is radiation. High-tech ma- chines candetect very small amounts of radiation from mobile phones. Mobile phonecompanies agree that there is some radiation,but they say the amount is toosmall to worry about.
As the discussion about theirsafety continues,it appears that it's best to use mobile phones less often. Useyour regular phone if you want to talk for a long time. Use your mobile phoneonly when you really need it. Mobile phones can be very useful andconvenient,especially in emergencies. In the future, mobile phones may have awarning label that says they are bad for your health. So for now,it's wise notto use your mobile phone too often.
People buy cell phones for the following reasons EXCEPT that
A.they're popular
B.they're usefuL
C.they're cheap
D.they're convenient
第5题
Who is listening to this announcement？
A．A football team.
B．Hospital patients.
C．Airplane passengers.
D．A theater audience.
第6题
Cell Phone Lets Your Secret Out
Your cell phone holds secrets about you. Besides the names and ______【51】that you've programmed into it, traces of your DNA linger on the device, according to a new study.
DNA is genetic material that______【52】in every cell. Like your fingerprint, your DNA is unique to you______【53】you have an identical twin. Scientists today routinely analyze DNA in blood, saliva, or hair left______【54】at the scene of a crime. The results often help detectives identify______【55】and their victims. Your cell phone can reveal more about you . _____【56】you might think.
Method J. McFadden, a scientist at McMaster University in Hamilton, Ontario, heard about a crime in which the suspect bled onto a cell phone and later dropped the______【57】. This made her wonder whether traces of DNA lingered on cell phones—even when no blood was involved.
______【58】she and colleague Margaret Wallace of the City University of New York analyzed the flip-open phones of 10 volunteers. They used swabs to collect______【59】traces of the users from two parts of the phone: the outside, where the user holds it, and the______【60】, which is placed at the user's ear.
The scientists scrubbed the phones using a solution made mostly______【61】alcohol. The aim of washing was to remove all detectable traces of DNA. The owners got their phones______【62】for another week. Then the researchers collected the phones and repeated the swabbing of each phone once more.
The scientists discovered DNA that ______【63】to the phone's speaker on each of the phones. Better samples were collected from the outside of each phone, but those swabs also picked up DNA that belonged to other people who had apparently also handled the phone. ______【64】, DNA showed up even in swabs that were taken immediately after the phones were scrubbed. That suggests that washing won't remove all traces of evidence from a criminal's device. So cell phones can now be added to the______【65】of clues that can clinch a crime-scene investigation.
(51)
A．numbers
B．music
C．secrets
D．films
第7题
Cell Phones:Hang Up or Keep Talking？
Millions of people areusing cell phones today. In many places it is actually considered unusualnot to use one. In many countries, cellphones are very popular with young people. They find that the phones are morethan a means of communication-having a mobile phone shows that they are cooland connected.
The explosions around theworld in mobile phone use make some health professionals worried. Some doctors are concerned that in the futuremany people may suffer health problems from the use of mobile phones. InEngland,there has been a seriousdebate about this issue. Mobile phone companies are worried about the negativepublicity of such ideas. They say that there is no proof that mobile phones arebad for your health.
On the other hand,why dosome medical studies show changes in the brain cells of some people whouse mobile phones？ Signs of change inthe tissues of the brain and:head can be detected with modern scanning(扫描)equipment In onecase,a traveling salesman had to retire at a young age because of seriousmemory loss. He couldn't remember evensimple tasks. He would often forget the name of his own son This man usedto talk on his mobile phone for aboutsix hours a day,every day of his working week,for a couple of years. His family do'ctor blamed his mobile phoneuse,but his employer's doctor didn't agree.
What is it that makes mobilephones potentially harmful？ The answer is radiation High-tech machines candetect very small amounts of radiation from mobile phones. Mobile phonecompanies agree that there is some radiation,but they 'say the amount is toosmall to worry about.
As the discussion abouttheir safety continues,it appears that it's best to use mobile phones less often. Use your regular phone if you want totalk for a long time. Use your mobile phone only when you really need it. Mobile phones can be veryuseful and convenient,especiaIIY in emergencies. In the future,mobile phones may have a warning labelthat says they are bad for your health. So for now,it's .wise not to use yourmobile phone too often.
People buy cell phones for the following reasons EXCEPT that
A.they ' re cheap
B.they're popular
C.they're usefu
D.they're convenient
第8题
请根据短文内容，回答题。
Cell Phones: Hang Up or Keep Talking？
Millions of people are using cell phones today. In many places it is actually considered unusual not to use one. In many countries, cell phones are very popular with young people. They find that the phones are more than a means of communication--having a mobile phone shows that they are cool and connected.＜br＞
The explosions around the world in mobile phone use make some health professionals worded.＜br＞
Some doctors are concerned that in the future many people may suffer health problems from the use of mobile phones. In England, there has been a serious debate about this issue. Mobile phone companies are worded about the negative publicity of such ideas. They say that there is no proof that mobile phones are bad for your health.＜br＞
On the other hand, why do some medical studies show changes in the brain cells of some who use mobile phones？ Signs of change in the tissues of the brain and head can be deteeted with modern scanning (扫描) equipment. In one case, a traveling salesman had to retire at a young age because of serious memory loss. He couldn&39;t remember even simple tasks. He would often forget the name of his own son. This man used to talk on his mobile phone for about six hours a day, every day of his working week, for a couple of years. His family doctor blamed his mobile phone use, but his employer&39;s doctor didn&39;t agree.＜br＞
What is it that makes mobile phones potentially harmful？ The answer is radiation. High-tech machines can detect very small amounts of radiation from mobile phones. Mobile phone companies agree that there is some radiation, but they say the amount is too small to worry about.＜br＞
As the discussion about their safety continues, it appears that it&39;s best to use mobile phones less often. Use your regular phone if you want to talk for a long time. Use your mobile phone only when you really need it. Mobile phones can be very useful and convenient, especially in emergencies. In the future, mobile phones may have a warning label that says they are bad for your health. So for now, it&39;s wise not to use your mobile phone too often.
People buy cell phones for the following reasons EXCEPT that__________. 查看材料
A.they"re popular.
B.they"re cheap.
C.they"re useful.
D.they"re convenient.
第9题
Sugar Power for Cell Phones
Using enzymes commonly found in living cells, a new type of fuel cell produces small amounts of electricity from sugar. If the technology is able to succeed in mass production, you may some day share your sweet drinks with your cell phone.
In fuel cells, chemical reactions generate electrical currents. The process usually relies on precious metals, such as platinum. In living cells, enzymes perform. a similar job, breaking down sugars to obtain electrons and produce energy.
When researchers previously used enzymes in fuel cells, they had trouble keeping them active, says Shelley D. Minteer of St Louis University. Whereas biological cells continually produce fresh enzymes, there's no mechanism in fuel ceils to replace enzymes as they quickly degrade.
Minteer and Tamara Klotzbach, also of St Louis University, have now developed polymers that wrap around an enzyme and preserve it in a microscopic pocket. "We tailor these pockets to provide the ideal microenvironment" for the enzyme, Minteer says. The polymers keep the enzyme active for months instead of days.
In the new fuel cell, tiny polymer bags of enzyme are embedded in a membrane that coats one of the electrodes. When glucose from a sugary liquid gets into a pocket, the enzyme oxidizes it, releasing electrons and protons. The electrons cross the membrane and enter u wire through Which they travel to the other electrode, where they react with oxygen in the atmosphere to produce water. The flow of electrons through the wire constitutes an electrical current that can generate power.
So far, the new fuel cells don't produce much power, but the fact that they work at all is exciting, says Paul Kenis, a chemical engineer at the University of Illinois at Urbana-Champaign. "Just getting it to work," Kenis says, "is a major accomplishment."
Sugar-eating fuel cells could be an efficient way to make electricity. Sugar is easy to find. And the new fuel cells that mn on it are biodegradable,, so the technology wouldn't hart the environment. The scientists are now trying to use different enzymes that will get more power from sugar. They predict that popular products may be using the new technology in as little as 3 years.
According to the first paragraph, when can we share our sweet drinks with our cell phones？
A．When enzymes can be commonly found in living cells.
B．When the technology of producing a new type of fuel cell appears.
C．When the technology of a new type of fuel cell is suitable for mass production.
D．When the technology of mass producing cell phones appears.
