London—coffee protects mice from radiation and could get the same way in humans, according to Indian scientists.
Scientist at India’s Bhabha Atomic Research Center discovered that mice injected with caffeine (咖啡因)remained alive after high doses(劑量)of normally lethal radiation.
Although the study was limited to animals, Kachadillilli George, head of the research team, believes the findings could have implications (something suggested )  for humans .
“It does suggest that coffee might have some beneficial effects in protecting against radiation,” he told New Scientist magazine late last month.
George and his team injected 471 mice with caffeine and left them uncovered to 7.5 grays of gamma radiation(伽瑪射線),enough to kill most mice. But 25 days later 70 percent of the mice that had received 80 milligrams(毫克)of caffeine per kilogram of body weight were still alive.
On the contrary all 196 mice that had been left uncovered to the same radiation but had not been given any caffeine died.
小題1:George and his team drew the conclusion from    .
A.the magazineB.their inventionC.the experimentD.their experience
小題2:From the news, we know     can be protected from radiation.
A.both mice and humansB.only mice
C.only humansD.neither humans nor mice
小題3:From paragraph 5, we know 30 percent of the mice died 25 days later. The reason was probably that     .
A.these mice had been given only 80 milligrams of caffeine
B.these mice hadn’t been injected with caffeine
C.these mice were very big and strong
D.these mice hadn’t been given enough caffeine
小題4:Which is the best title of the article?
A.Human and MiceB.New Radiation Defense—Coffee
C.Deadly Radiation—Gamma RadiationD.Mice Died of Caffeine
小題5:In paragraph 2,the underlined word “ lethal ”means   .
A.causing deathB.livelyC.excitingD.rich

小題1:C
小題2:A
小題3:D
小題4:B
小題5:C

試題分析:本文介紹了一項(xiàng)新的研究發(fā)現(xiàn),科學(xué)家對老鼠做的實(shí)驗(yàn),得出結(jié)論咖啡因可以使老鼠和人類防御輻射。
小題1:推理題:從第五段的內(nèi)容,可知科學(xué)家對老鼠做的實(shí)驗(yàn),然后得出結(jié)論的。選C
小題2:細(xì)節(jié)題:從第一段的內(nèi)容:London—coffee protects mice from radiation and could get the same way in humans,可知老鼠和人類都可以免受輻射的影響。選A
小題3:細(xì)節(jié)題:從文章的最后一段:On the contrary all 196 mice that had been left uncovered to the same radiation but had not been given any caffeine died.可知這些老鼠沒有被注射過咖啡因。選D
小題4:主旨題:從第一段和第二段的內(nèi)容,可知講的是咖啡因可以防御輻射。選B
小題5:猜詞題:從所在的句子的remained alive可知這些劑量本來是可以導(dǎo)致死亡的。選A
點(diǎn)評:閱讀理解首先要能基本讀懂文章,然后再根據(jù)問題,在文章中去找到相應(yīng)的依據(jù),研究相關(guān)信息句給出準(zhǔn)確的答案。本文集中考查了細(xì)節(jié)題,要求考生仔細(xì)閱讀全文,做好相應(yīng)的標(biāo)志,以提高閱讀的效率和速度
練習(xí)冊系列答案
相關(guān)習(xí)題

科目:高中英語 來源:不詳 題型:閱讀理解

In the near future, people in some parts of the world will watch a new kind of television. It is called the high definition television or the HD-TV. The main difference between an HD-TV and a normal television is the picture. It is more clear and detailed. This is because the HD-TV has many more points and lines that make a television image. Every color television picture contains thousands of red, green and blue points. They all come together as an image in the eye of the person watching. The points are organized in lines that go across the television screen. There are more than five hundred lines in a normal television. The HD-TV has two times as many. To get this clear picture, you must have a big screen. Experts say people using a small screen will see little difference.
The HD-TV also has clear sound. It is like the sound on a CD. All these improvements make an HD-TV very costly. One kind in Japan now sells for more than twenty thousand dollars .A major problem with the HD-TV is its broadcast signal(傳播信號.The signal is bigger than normal because it carries more electronic information.
小題1: What is the main difference between an HD-TV and a normal television?  It is        .
A.the picture B.the shapeC.the voiceD.the weight
小題2: What is a color TV image?
A.It is made up of thousands of red, green, and blue points.
B.Points are organized in lines that go across the TV screen.
C.It is a black and white picture
D.Both A and B
小題3: How many lines does an HD-TV have?
A.Over 250B.More than 500
C.More than 1,000 D.About 250
小題4: What should you do if you want to get a clear and detailed picture from an HD-TV?
A. You must have the bigger signal for the HD-TV. 
B. You have to get a big screen.
C. You should have a compact disc player.     
D. Both A and B.

查看答案和解析>>

科目:高中英語 來源:不詳 題型:閱讀理解

Liverpool city council (市政廳) want to clear the city of fat pigeons (鴿子). They say that people are feeding the birds, which makes them fat. The pigeons get bigger because they normally eat seeds (種子) and insects (昆蟲) for their main food, not high-fat junk food they are eating in the city centre.
The council want people to know that everyone who feeds the pigeons makes the streets crowded (擁擠)with these birds. They hope to encourage the birds to move away from the city centre and into parks and open spaces.
Ten robotic birds have been brought into the city centre to scare the pigeons away and visitors are asked not to give the pigeons any food. The mechanical birds—known as ‘robops’—will sit on the roofs of buildings. They can be moved around to different places. They look like a peregrine falcon, which is a bird that kills pigeons. They even make noises and flap their wings to scare the pigeons. They hope that the pigeons will go away before the city becomes the European Capital of Culture in two years.
小題1:Liverpool city council want to clear the city of fat pigeons because ______.
A.the pigeons are eating junk food
B.the pigeons might get killed
C.the pigeons make the city center crowded
D.the pigeons sit on the roofs of buildings
小題2:What do we know about a peregrine falcon?
A.It scares the robotic birds.B.It is an enemy of the pigeons.
C.It looks like a pigeon.D.It likes the food people give it.
小題3:Which of the following is probably true according to passage?
A.The robots will fly around the city center like real birds.
B.Pigeons get fat because they eat seeds and insects.
C.Liverpool is the European Capital of Culture.
D.The pigeons like the food that people give them.

查看答案和解析>>

科目:高中英語 來源:不詳 題型:閱讀理解

根據(jù)短文內(nèi)容,從短文的選項(xiàng)中選出能填入空白處的最佳選項(xiàng),選項(xiàng)中有兩項(xiàng)為多余選項(xiàng)。
Every boy and every girl expects their parents to give them pocket money. Why do their parents just give them a certain amount?    1  
The amount of money that parents give to their children to spend as they wish differs from family to family.   2  Some children get weekly pocket money. Others get monthly pocket money.
First of all, children are expected to make a choice between spending and saving. Then parents should make the children understand what is expected to pay for with the money. At first, some young children may spend all of the money soon after they receive it. Parents are usually advised not to offer more money until it is the right time.  3  
In order to encourage their children to do some housework, some parents give pocket money if the children help around the home. Some experts think it not wise to pay the children for doing that.   4  
Pocket money can give children a chance to experience three things they can do with the money. They can spend it by giving it to a good excuse. They can spend it by buying things they want.   5  Saving helps children understand that costly goals require sacrifice(犧牲). Saving can also open the door to future saving and investing(投資)for children.
A.They can save it for future use.
B.Timing is another consideration(考慮).
C.As helping at home is a normal part of family life.
D.Some children are not good at managing the pocket money.
E.Learning how to get money is important for children.
F.One purpose(目的)is to let kids learn how to manage their own money.
G.By doing so, these children will learn that spending must be done with a budget

查看答案和解析>>

科目:高中英語 來源:不詳 題型:閱讀理解

Looking for some inspiration or the “write” kind of ideas for your creative stories? To start with, some writers describe winter by using their five senses or their imagination. Others write on their favorite winter activity. Whatever you choose to write about, working on a winter story can always help to improve your writing skills. Now read the following story and see if it helps get rid of any icy writing block you’ ve been struggling with.
A Winter Adventure 
Beep, beep. Beep-beep: the alarm clock rang. Slowly, I got out of warm bed down onto the wooden floor which the winter had thrown its cold upon. The bitter cold temperature penetrated   (穿透)my socks and I hurried to put my feet in shoes.
Looking out of the window, I watched the white snow, soft and thick, drop onto rooftops and trees. Half an hour later, finishing the last of my hot chocolate, I prepared to enter the adventure that waited for me outside. I buttoned my jacket and fastened my boots. Hat on, I opened the door and was greeted by the winter coldness.
In the depths of winter, the early morning did not have the rush of the rest of the year. Most of my neighbours were put off by the cold, and stayed in bed until the sun had climbed higher into the sky.
Unseen by those who remained locked inside their homes, warm in their beds, I enjoyed being alone with the beauty of the wintertime. Those indoors were unable to appreciate the snow-scapes, ice crystals, frost and the crisp(清新的)breeze. For them, the coming of winter meant just the arrival of the cold.
Appreciation depends on contrasts. One cannot love the warmth of April if one has not known the freezing cold of winter. Later that year, the heat of the sun on my skin would be all the more wonderful for my memories of that cold morning and others like it.
小題1:The underlined word “adventure” refers to____________.
A.getting out of bed on the cold winter morning.
B.enjoying the loveliness of the winter outdoors
C.going skiing on the cold winter morning
D.throwing snowballs with friends.
小題2:According to the story A Winter Adventure, most of the neighbours _________.
A.didn’t work in winterB.stayed up late in winter
C.missed the beauty of winterD.enjoyed the seasons except winter
小題3:Which of these statements is true according to the story A Winter Adventure?
A.Of all the seasons, the writer loves winter most.
B.The writer regrets that he went out on the freezing cold winter morning.
C.The writer believes contrast makes our experiences of the seasons lovelier.
D.The writer values the autumn and summer more than the winter
小題4:What function does the story A Winter Adventure serve?
A.To share some winter thoughts with readers.
B.To show readers how to work on a winter story.
C.To inspire readers to take more exercise in winter
D.To tell readers how to appreciate the beauty of winter.

查看答案和解析>>

科目:高中英語 來源:不詳 題型:閱讀理解

I was in my third year of teaching creative writing at a high school in New York, when one of my students, 15-year-old Mikey, gave me a note from his mother. It explained his absence from class the day before.
I had seen Mikey himself writing the note at his desk. Most parental-excuse notes I received were penned by my students. If I were to deal with them, I’d be busy 24 hours a day.
The forged excuse notes made a large pile, with writing that ranged from imaginative to crazy. The writers of those notes didn’t realize that honest excuse notes were usually dull: “Peter was late because the alarm clock didn’t go off.”
Isn’t it remarkable, I thought, how the students complained and said it was hard putting 200 words together on any subject? But when they produced excuse notes, they were brilliant.
So one day I typed out a dozen excuse notes and gave them to my classes. I said, “They’re supposed to be written by parents, but actually they are not. True, Mikey?” The students looked at me nervously.
“Now, this will be the first class to study the art of the excuse note --- the first class, ever, to practice writing them. You’re so lucky to have a teacher like me who has taken your best writing and turned it into a subject worthy of study. ”
Everyone smiled as I went on, “You used your imaginations. So try more now. Today I’d like you to write ‘An Excuse Note from Adam to God’ or ‘An Excuse Note from Eve to God’.” Heads went down. Pens raced across paper. For the first time ever I saw students so careful in their writing that they had to be asked to go to lunch by their friends.
The next day everyone had excuse notes. Heated discussions followed. The headmaster entered the classroom and walked up and down, looking at papers, and then said, “I’d like you to see me in my office.”
When I stepped into his office, he came to shake my hand and said, “I just want to tell you that that lesson, that task, whatever the hell you were doing, was great. Those kids were writing on the college level. Thank you. ”
小題1:What did the author do with the students found dishonest?
A.He reported them to the headmaster.B.He lectured them hard on honesty.
C.He had them take notes before lunch.D.He helped improve their writing skills.
小題2:The author found that compared with the true excuse notes, the produced ones by the students were usually__________.
A.less impressiveB.more imaginativeC.worse writtenD.less convincing
小題3:The author had the students practice writing excuse notes so that the students could learn_________.
A.the importance of being honestB.how to write excuse notes skillfully
C.the pleasure of creative writingD.how to be creative in writing
小題4:The underlined word “forged” in the second paragraph means “______”.
A.formerB.copiedC.falseD.honest
小題5:What did the headmaster think of the author’s way of teaching?
A.Effective. B.DifficultC.Misleading.D.Reasonable

查看答案和解析>>

科目:高中英語 來源:不詳 題型:完形填空

Many of the world’s pollution problems have been caused by the crowding of large groups of people into the cities. Supply for the needs of the people leads to further   1  by industry. If the rapid increase of world continues at the present rate, there may be much greater to human beings. Some scientists of the increase in numbers of people as “population pollution(人口公害)”.
About 2, 000 years ago, the world population was about 250 million. It  5 a billion in 1850. By 1930 the population was two billion. It is now six billion. It is  6 to double by the year 2020. If the population  7  to grow at the same rate, there will be 25 billion people in the 8   a hundred years from now.
Man has been 9   the earth’s resources more and more 10   over the past years. Some of them are almost gone. Now many people believe that man’s 11   problem is how to control the 12   of the population. The material supplies in the world will be far from enough to  13  the human population if the present rate of increase continues. There is already over-crowding(過分擁擠)in many cities and  14  in some countries. Many people believe that human survival(生存) in the future  15  on the answer to the question.
小題1:
A.progressB.pollutionC.educationD.production
小題2:
A.a(chǎn)gricultureB.industryC.environmentD.population
小題3:
A.dangerB.harm C.benefitD.hardship
小題4:
A.dreamB.a(chǎn)pproveC.ridD.speak
小題5:
A.gotB.took C.broughtD.reached
小題6:
A.suggestedB.hopedC.expectedD.said
小題7:
A.continuesB.fails C.triesD.means
小題8:
A.worldB.countryC.starD.end
小題9:
A.discoveringB.usingC.diggingD.destroying
小題10:
A.seriouslyB.dangerouslyC.rapidlyD.steadily
小題11:
A.greatestB.easiestC.lightestD.simplest
小題12:
A.existenceB.startC.growthD.birth
小題13:
A.increaseB.decreaseC.reportD.support
小題14:
A.discussionB.starvationC.constructionD.a(chǎn)rgument
小題15:
A.dependsB.a(chǎn)greesC.savesD.passes

查看答案和解析>>

科目:高中英語 來源:不詳 題型:閱讀理解

Britain’s seed(種子) bank, the only one in the world aiming to collect all of the planet’s wild plant species, has reached its goal of banking 10 percent by 2010.
The Millennium Seed Bank Project, run by Kew Gardens—one of the oldest botanical(植物的)  gardens—will officially place the 24,200th species on Thursday, a pink, wild banana from China.
More than 50 countries are now on board with Kew's giant task but vast places of the globe, including India and Brazil, still need to join in and donate seeds, director Paul Smith said.                                                                                                                                                            
The seed bank is one of the largest and most diverse(多樣的) in the world with more than 1.5 billion seeds. Its goal is to help protect the planet’s bio-diversity during a time of climate change.
The wild banana seed is under threat of extinction(滅絕) in southwest China from agricultural development. It is a vital food source for Asian elephants and important for growing bananas for human eating.
Stored at minus-20 degrees centigrade, so they can last for thousands of years, the seeds await the day that scientists hope never comes—when the species no longer exist in the wild.
It is a race against time, Smith said, because in the last ten years alone, 20 plants held in the bank have already been wiped out in the wild. He estimates that between a third and a quarter will become extinct this century.
"It is pressing and it is happening now. An area, the size of England, is cleared of primary vegetation(植被)every year." Smith said.
Because most of the world's food and medicines come from nature, protecting wild plant species is quite important, scientists say. There are already many other seed banks safeguarding food crops, which only account for 0.6 percent of plant diversity.
For Kew's next goal—to collect a quarter of wild varieties(種類)by 2020—the botanists need 10 million pounds a year, or a further 100 million pounds on top of the 40 million they have already been granted.
小題1:What’s the final purpose of the Britain’s seed bank?
A.To collect enough money for the project.B.To safeguard food crops.
C.To protect wild plants from extinction.D.To help scientists study wild plants.
小題2:We can learn from the passage that _______.
A.the seeds in the bank can be used now and then all over the world
B.India and Brazil haven’t joined in the Seed Bank Project at present
C.there is only one seed bank in the world at present
D.the wild plants in places like India and China will never die out
小題3:What does the underlined word “it” in paragraph 7 refer to?
A.The extinction of plant species.
B.The Millennium Seed Bank Project.
C.Britain’s seed bank.
D.Kew Gardens’ next goal.
小題4:Which of the following isn’t spoken about in the passage?
A.The global partnership of collecting wild plant species.
B.The temperature condition of the wild plant species in the bank.
C.The government’s support for the seed bank project by giving money.
D.Scientists’ concern on the extinct wild plant species.

查看答案和解析>>

科目:高中英語 來源:不詳 題型:閱讀理解

Do you still get free plastic bags(塑料袋) from the supermarket(超市)? Things will change soon.
To protect(保護(hù)) the environment, supermarkets in China will stop providing (提供) free plastic bags after June 1st. If you don't want to pay money to buy them, you'll have to bring your own shopping bag.
What kind of bags will be the best to bring? Students in Kunming Xinying Middle School have some good ideas.
Recently 54 students of the school held an activity in which they made their own environmentally-friendly shopping bags.
Most students used old clothes to make their bags. They painted pictures like the Olympic rings on them.
But Wang Shuncheng, a Junior 2 boy, chose a different material (材料). He made his bag with old newspaper. Is a newspaper bag strong enough to hold shopping? Wang says it is, "No problem. I put six bottles of water in the bag," he said. "It's strong enough!"
Chen Lisi, a girl, had a more traditional way to make her bag – she weaved (編織) a bamboo basket. It was not an easy job. With her grandfather's help, Chen spent a whole afternoon making it. She also weaved wool (毛線) flowers on the basket.
Making bags was not all the students did. They had another job: to persuade their parents and relatives to use environmentally-friendly shopping bags instead of plastic ones. The school will show the bags so that shops and stores can get inspiration (靈感) from the students' work.
小題1:On June 2nd, if you don’t bring a shopping bag, ________ in the market.
A.you can get free plastic bags
B.you’ll have to pay for the plastic bags
C.you can’t buy anything
D.you can’t use plastic bags
小題2:From the passage, we can infer(推測) that ___________.
A.Plastic bags will not come into our life any more.
B.When you go shopping after June 2nd, you have to bring a shopping bag.
C.Plastic bags are bad for the environment.
D.No one will use plastic bags after June 2nd.
小題3:What does “persuade” in the last paragraph mean?
A.勸說B.阻止C.保證D.反對
小題4:Supermarkets in China stop providing plastic bags because _________.
A.they want to save money
B.markets want to make more money
C.plastic bags are very expensive
D.they want to protect the environment
小題5:Which of the following is not right from the passage?
A.People may use other material to make shopping bags.
B.The students’ work may bring inspiration to the supermarkets.
C.You can’t use plastic bags in supermarkets any more after June 1st.
D.The newspaper bag made by Wang Shuncheng seems strong.

查看答案和解析>>

同步練習(xí)冊答案