题目
题型:不详难度:来源:
Leaves are nature"s food factories. Plants take water from the ground through their roots. They take a gas called carbon dioxide from the air. Plants use sunlight to turn water and carbon dioxide into glucose, which is a kind of sugar. Plants use glucose as food for energy and as a building block for growing. The way plants turn water and carbon dioxide into sugar is called photosynthesis, which means " putting together with light. " A chemical called chlorophyll helps make photosynthesis happen. Chlorophyll is what gives plants their green color.
As summer ends and autumn comes, the days get shorter and shorter. This is how the trees "know" to begin getting ready for winter.
During winter, there is not enough light or water for photosynthesis. The trees will rest, and live off the food they stored during summer. They begin to shut down their food-making factories. The green chlorophyll disappears from the leaves. As the bright green fades away, we begin to see yellow and orange colors. Small a-mounts of these colors have been in the leaves all along. Covered up by the green chlorophyll, we just can"t see them in summer.
The bright reds and purples we see in leaves are made mostly in the fall. In some trees, like maples, glucose is trapped in the leaves after photosynthesis stops. Sunlight and the cool nights of autumn cause the leaves turn this glucose into a red color. The brown color of trees like oaks is made from wastes left in the leaves.
It is the combination of all these things that make the beautiful colors we enjoy in the fall.
小题1:The writer asked two questions in the beginning in order to .
A.persuade readers to believe something |
B.introduce the topic of the passage |
C.get the readers excited |
D.offer something to think over |
A.Trees don"t change colours with seasons. |
B.Trees can still perform photosynthesis well in winter. |
C.Trees have colours like yellow and orange even in summer. |
D.Trees don"t need food in winter. |
A.plants change water and carbon dioxide into sugar |
B.plants turn water and carbon dioxide into sugar with the help of sunlight |
C.plants use glucose as food for energy and growing |
D.chlorophyll is a great help |
A.Colorful trees in autumn | B.Mysteries of tree colors |
C.Do you enjoy tree colors? | D.Wonderful colors in autumn |
答案
小题1:B
小题2:C
小题3:B
小题4:B
解析
核心考点
试题【We all enjoy the colors of autumn leaves. Did you ever wonder how and why a fall】;主要考察你对题材分类等知识点的理解。[详细]
举一反三
“IT’S A BEAUTIFUL DAY,” he shouted.“THE SKY IS BLUE, AND THERE’S A GENTLE WIND, AND THE WATER IS CALM, AND…”
Behind me, a woman, her mobile phone pressed to her ear was walking back and forth.
“She DIDN’T,” she was saying.“No.She DIDN’T.She DID? Really? Are you SERIOUS? She did NOT.She DID? No she…”
And so on.This woman had two children, who were playing in the sea.I found myself watching them, because the woman surely was not.A huge squid could have caught and snatched the children, and this woman would not have noticed.Or, if she had noticed, she’d have said, “Listen.I have to go, because a huge squid just……No! She didn’t ! She DID? No! She……”
And next to me, the play-by-play man would have said: “…AND A HUGE SQUID JUST ATE TWO CHILDREN, AND I’M GETTING A LITTLE SUNBURNED, AND …”
It used to be that the major trouble at the beach was the fellow who brought a boom box (便携式录音机) and turned it up so loud that the bass notes caused seagulls to explode.But at least you knew where these fellows were; you never know which beachgoers have mobile phones.You’ll settle next to what appears to be a sleeping sunbather, or even (you hope) a corpse , and you’ll lie happily on your towel, and you’ll get all the way to the second sentence of your 467-page book before you fall asleep to the hypnotic surge of the surf (催人入梦的潮声), and …
BREEP! BREEP! The corpse sits up, feels urgently for its mobile phone, and shouts “Hello! I’m at the beach! Yes! It’s nice! Very peaceful! What? She did? No, she didn’t! She DID? No, she…”
Loud mobile-phoners never seem to get urgent calls.Just once, I’d like to hear one of them say, “Hello? Yes, this is Dr.Johnson.Oh, Dr.Smith.You’ve opened the abdominal cavity (腹腔)? Good! Now the appendix should be right under the … What? No, that’s the liver.Don’t take THAT out, ha ha! Oh, you did? My God! OK, now listen carefully…”
小题1:From the passage we can know that the writer of the passage _____.
A.had a wonderful holiday at the beach |
B.must have suffered a lot because of the terrible weather |
C.is only interested in talks by doctors about operation |
D.experienced an unhappy holiday at the beach |
A.The writer often spends his holidays at the beach. |
B.A huge squid ate two children while their mother was not watching. |
C.Some people used to play boom box while spending their holidays at the beach. |
D.Some people often make loud mobile phone calls without caring for others. |
A.a dead body | B.a loud mobile phone |
C.a sound sleeper | D.a sleep lover |
A.turned it up to make the seagulls happy |
B.turned it up to cause the seagulls to explode |
C.might cause less trouble than the beachgoers with mobile phones |
D.might cause more trouble than the beachgoers with mobile phones |
A.the writer is interested in mobile phone. |
B.the writer hates people using mobile phone |
C.the writer hates to be disturbed while enjoying holidays on the beach. |
D.the writer seldom finishes reading a book before going to sleep. |
Nicknamed the Car-puccino, it has been created using a 1988 Volkswagen Scirocco bought for £400 and it was chosen because it looked like the time-traveling DeLorean in the movie Back To The Future.The car will be driven the 210 miles between Manchester and London powered only by roasted coffee granules (颗粒).It has been built by a team from the BBC1 science programme Bang Goes The Theory and will go on display at the Big Bang science fair in Manchester to show how fuels other than traditional petrol can power vehicles.
The team calculates the Car-puccino will do three miles per kilo of ground coffee (咖啡粉) — about 56 cups of espressos (浓咖啡) per mile.The journey will use about 70 kilos of ground coffee which, at supermarket prices of between £13 and £26 a kilo depending on brand and quality, will cost between £910 and £1,820, or between 25 and 50 times the £36 cost of petrol for the journey.In total, the trip will cost 11,760 espressos, and the team will have to take ‘coffee breaks’ roughly every 30 to 45 miles to pour in more granules.They will also have to stop about every 60 miles to clean out the ‘coffee filters’ to rid them of the soot and tar which is also generated by the process.So despite a top speed of 60mph, the many stops mean the going will be slow, with the journey taking around ten hours.
Sadly, the inventors will still have to pay duty on their coffee fuel---even though tax collectors at Her Majesty’s Revenue and Custom haven’t yet worked out how much.
Nick Watson, producer of Bang Goes The Theory, said, “Coffee, like wood or coal, has some carbon content so you can use it as a fuel.The coffee needs to be very dry and in granules to allow the air to move through the pile of coffee as it burns.The brand doesn’t matter.” He said the same technology could be used to power a car on other unusual fuels, such as woodchips or nut shells, construction or agricultural waste.
小题1:Which is the right way to choose the coffee used as fuels to run the Car-puccino?
A.It should be very dry. | B.The stronger, the better. |
C.The smaller the granules are, the better. | D.It should be of a certain brand. |
A.All kinds of materials can be used as fuels. |
B.The Car-puccino will be put into the market soon. |
C.Nick Watson is the designer of the Car-puccino |
D.Much remains to be improved for the Car-puccino. |
A.it makes a lot of noise |
B.it runs at a very high cost |
C.it has to stop to be refueled very often |
D.it’s not good enough for long-distance journey |
A.About 70 kilos | B.About 42 kilos. | C.About 32 kilos | D.About 30 kilos |
A.It looks like wood or coal. | B.It contains some carbon content. |
C.It is very cheap. | D.It is much better than woodchips or nut shells. |
Over 2000 years ago in Greece,certain days in the year were festival days.These were holidays when people stopped work and enjoyed themselves.They liked to watch athletes take part in races and other games of skill.
The most important festival was held every four years at the town of Olympia.It was held in honor of the Greek god Zeus(Zus).For five days,athletes from all parts of the Greek world took part in the Olympic Games.At the Olympic Games,people could watch them box,run,jump and so on.There was a relay race between two teams of men in which a lighted torch(火矩)was passed from runner to runner.The Olympic Games were thought to be so important that cities which were at war with one another had to stop fighting.People were allowed to travel to the games safely.Thousands of people came to Olympia from cities in Greece and from her colonies(殖民地)in Africa,Asia and Italy.They met as friends to cheer their favorite athletes and to enjoy themselves.
小题1:What happened in Greece over 2000 years ago?
A.People stopped work and enjoyed themselves. |
B.The cities there were often against one another. |
C.People watched baseball games. |
D.People didn’t go to any games at all. |
A.Friends. | B.Enemies. |
C.Colonies. | D.Other cities. |
A.They fought. | B.They just talked to friends. |
C.They cheered for good athletes. | D.They tried to find friends. |
A.Greece at War | B.Together for the Games |
C.Stop Fighting | D.Sport |
I started taking group skating lessons. Performing on ice came naturally. For me,skating has never been about beating others. It’s been about being my personal best. I progressed through various levels rapidly and gave my first ice performance at age seven. Soon I started winning local and regional competitions. That’s because being on the ice has always been the one place I can truly express my emotions. The ice is like home.
I began seriously training when I was nine years old. After graduating from girls’ high school,I moved to Canada. Saying goodbye to my family and friends made me homesick,but I knew deep down that I had to leave and train full-time to give my dreams a chance at reality.
I went to compete in the Olympic Games in 1992.I was the first of the final six skaters on the ice. My long performance started well,but I slipped while landing one of my easiest triple jumps,and my hand touched the ice. I didn’t want to make two mistakes in a row,so next I did a jump with just two spins to play it safe. As I neared the end,I had one more jump. I landed it perfectly.
When medals were awarded,I found myself on the top step,the gold hanging around my neck and America’s national anthem playing. Words can’t describe the overwhelming mixture of emotions I felt.
小题1:The author was enrolled in dance classes to________.
A.meet her interest |
B.improve her dancing skills |
C.help treat her feet |
D.prepare her for skating |
A.can express herself through her performance on ice |
B.can beat others in local and regional competitions |
C.can overcome her difficulty in walking |
D.has realized her dream to perform on ice |
A.she could get better treatment of her feet there |
B.she would do full-time training there |
C.that was where the Olympics would hold |
D.she wanted to have further study there |
A.She completed it without any mistake. |
B.She made one mistake on the final landing. |
C.She did it quite well except for one mistake. |
D.She made more than one mistake. |
A.we can realize our dream if we have the courage to pursue it |
B.even the disabled can take part in the Olympic Games |
C.sports can help people heal both body and mind |
D.sports events are not about winning only |
When the first spring came, everything was green except the locust tree.I felt very happy because I had thought it had died!
One morning, when I opened the window for some fresh air, I unexpectedly smelt a familiar sweet scent floating into my office which I could not name. Suddenly,I realized it was the locust tree!The tree that I thought dead was in full bloom!
From then on, I usually came to the office very early to see dew forming on the locust tree blossoms, and was eager to see spring again every year.
During summer, the green leaves provided shade protecting me from the harsh sunlight, but allowing enough light in to make it pleasant. In autumn, the leaves turned many different colors. Its beauty touched my soul. Many times, I thought to take photos but never did. Then, I had to leave in a hurry. Later in life, it became a great regret that I had not done so.
Actually, many times in our lives we think we own something and thus do not value it. We don"t feel regretful until we lose it one day! Moreover, sometimes, we have to accept the things we don"t want and need to discover the hidden beauty to find unexpected joy!
小题1: The locust tree first attracted the author most by____.
A.the way it blocked the view | B.its height |
C.the smell of its flowers | D.its green leaves |
A.Spring. | B.Summer | C.Autumn. | D.Winter. |
A.He would have regretted if the locust tree had died as he had thought it had. |
B.The locust tree turned out to be a lovely memory for him. |
C.He felt unhappy as he had forgotten to take the photos with him. |
D.His work in the office changed with the seasons every year. |
A.the locust tree died soon after the author left the office |
B.the author worked in the office for at least a few years |
C.it was summer when the author took his job in the office |
D.the weather was dry when the author first saw the tree |
A.Treasure what we"ve owned. | B.Look before you leap. |
C.Treat everything calmly. | D.Never forget the past. |
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