年級(jí) | 高中課程 | 年級(jí) | 初中課程 |
高一 | 高一免費(fèi)課程推薦! | 初一 | 初一免費(fèi)課程推薦! |
高二 | 高二免費(fèi)課程推薦! | 初二 | 初二免費(fèi)課程推薦! |
高三 | 高三免費(fèi)課程推薦! | 初三 | 初三免費(fèi)課程推薦! |
科目:高中英語 來源: 題型:閱讀理解
Plants can’t communicate by moving or making sounds, as most animals do. Instead, plants produce volatile compounds, chemicals that easily change from a liquid to a gas .A flower’s sweet smell, for example, comes from volatile compounds that the plant produces to attract insects such as bugs and bees.
Plants can also detect volatile compounds produced by other plants. A tree under attack by hungry insects, for instance, may give off volatile compounds that let other trees know about the attack, In response, the other trees may send off chemicals to keep the bugs away- or even chemicals that attract the bugs’ natural enemies.
Now scientists have created a quick way to understand what plants are saying: a chemical sensor(傳感器) called an electronic nose. The “e-nose” can tell compounds that crop plants make when they’re attacked. Scientists say the e-nose could help quickly detest whether plants are being eaten by insects, But today the only way to detect such insects is to visually inspect individual plants. This is a challenging task for managers of greenhouses, enclosed gardens that can house thousands of plants.
The research team worked with an e-nose that recognizes volatile compounds. Inside the device, 13 sensors chemically react with volatile compounds. Based on these interactions, the e-nose gives off electronic signals that the scientists analyze using computer software.
To test the nose, the team presented it with healthy leaves from cucumber, pepper and tomato plants, all common greenhouse crops. Then the scientists collected samples of air around damaged leaves from each type of crop. These plants had been damaged by insects, or by scientists who made holes in the leaves with a hole punch (打孔器).
The e-nose, it turns out, could identify healthy cucumber, pepper and tomato plants based on the volatile compounds they produce. It could also identify tomato leaves that had been damaged. But even more impressive, the device could tell which type of damage by insects or with a hole punch had been done to the tomato leaves.
With some fine tuning, a device like the e-nose could one day be used in greenhouses to quickly spot harmful bugs, the researchers say. A device like this could also be used to identify fruits that are perfectly ripe and ready to pick and eat, says Natalia Dudareve, a biochemist at Purdue University in
49. We learn from the text that plants communicate with each other by______.
A. making some sounds B. waving their leaves
C. producing some chemicals D. sending out electronic signals
50. What did the scientists do to find out if the e-nose worked?
A. They presented it with all common crops..
B. They fixed 13 sensors inside the device.
C. They collected different damaged leaves.
D. They made tests on damaged and healthy leaves.
51. According to the writer, the most amazing thing about the e nose is that it can ______.
A. pick out ripe fruits
B. spot the insects quickly
C. distinguish different damages to the leaves
D. recognize unhealthy tomato leaves
52. We can infer from the last paragraph that the e-nose_____.
A. is unable to tell the smell of flowers
B. is not yet used in greenhouses
C. is designed by scientists at Purdue
D. is helpful in killing harmful insects
查看答案和解析>>
科目:高中英語 來源:2011-2012學(xué)年廣西桂林中學(xué)高一下學(xué)期期中考試英語試卷(帶解析) 題型:閱讀理解
Many people consider their pets members of the family and are very sad when they die, but what if you could clone your dog, cat or bird?
A scientist in New Orleans, who has proved his ability to clone other animals, is now offering the possibility to pet owners here in Wisconsin.
Scientists have not been able to clone dogs, cats or other pets, but if and when the time comes, several companies will be ready and able to do the job.
The question is: Are you ready to clone your pet? Brett Reggio is betting on it.He is working on his Ph. D at Louisian State University. He's successfully cloned a goat five times and wants to try the process on family pets. So he started a business called Lazaron. “What Lazaron provides is the first step in the cloning process. ”He said.“It’s for curing and storing the fiberglass cells that will be used for cloning.”
“Your first reaction is yeah! I think I’d like that.” said Donna Schacht, a pet owner.
“I don’t believe you can ever replace a special love,” pet owner Paulette Callattion said.
Most pet owners will tell you freezing your pet’s DNA in hopes of one day cloning it is a personal decision.
Scientists say that cloning your own pet doesn’t mean that the offspring(后代) will have the same intelligence, temperament(性情) or other qualities that your pet has.
【小題1】From the passage we know that scientists have ______.
A.tried to clone animals |
B.cloned many kinds of animals |
C.been able to clone pets for people |
D.once cloned goats successfully |
A.clone pets for people |
B.store the DAN of people’s pets for cloning one day |
C.make pets members of a family |
D.collect different ideas on cloning from people |
A.they think it would be too expensive |
B.they don’t think scientists will one day be able to clone their pets |
C.they think the cloned pet would not be the one they once had |
D.they don’t want to give any love to the cloned pet |
A.looked different from the pet you once had |
B.turned out to be another kind of animal |
C.had a different character |
D.were just the same pet your once had |
查看答案和解析>>
科目:高中英語 來源:山東淄博市2010屆高三下學(xué)期第二次模擬考試英語試卷 題型:閱讀理解
第三部分 閱讀理解(共20小題;每小題2分,滿分40分)
閱讀下列短文,從每題所給的四個(gè)選項(xiàng)(A、B、C、D)中選出最佳選項(xiàng)。
A
Knowing how much her own children loved presents at Christmas, Ann Sutton always tried to seek help for one or two poor families. With a social worker mother, the Sutton children had inherited her commitment to service, and knew never to take their good fortune at Christmas for granted. This year, Kinzie, her seven-year-old daughter was thrilled that Santa Claus would make a special visit to a 22-year-old mother named Ashley who worked in a factory raising her 12-month-old son by herself.
The phone rang on Sunday. A representative from a local organization was calling to say that the aid Ann had requested for Ashley had fallen through. No Santa Claus, no presents, nothing.
Ann saw the cheer vanish from her children’s faces at the news. Without a word, Kinzie ran into her bedroom. She returned, her face set with determination. Opening up her piggy bank, she put all the coins onto the table: $3.30. Everything she had.
“Mom,” she told Ann, “I know it’s not much. But maybe this will buy a present for the baby.”
At a breakfast meeting the next day, Ann told her coworkers about her daughter’s story. To her surprise, staff members began to open their purses and empty their pockets to help Kinzie. By day’s end, the story of Kinzie’s gift had spread beyond Ann’s office. She received a call from an unknown donor. If a seven-year-old could give everything she had, he said, he should at least match her gift 100 to 1. He contributed $300.
On Christmas Eve, Ann drove through the pouring rain to the small trailer where the Ashleys lived. Then she began to unload the gifts from the car, handing them to Ashley one by one.
Ashley was very moved. Reflecting on a little girl’s generosity, Ashley says she’ll one day be able to do something similar for someone else in need. “Kinzie could have used that money for herself, but she gave it away,” Ashley says. “She’s the type of kid I’d like my son to grow up to be.”
56. According to the text, Ann Sutton ______________.
A. is making lots of money
B. is ready to help others
C. is only caring about herself
D. is a hard-working mother
57. Which of the following is NOT true according to the text?
A. Ashley lived a hard life with her little son.
B. The Sutton children took Anne as an example to follow.
C. The coworkers of Ann helped Kinzie to realize her wish.
D. Ann Sutton tried to ask for help for her own children.
58. What can we learn about Kinzie?
A. She was afraid that Santa Claus would visit the Ashleys.
B. She should get some presents from her mother at Christmas.
C. She devoted all her coins to buying a present for the baby.
D. She was cheerful when hearing the aid had fallen through.
59. Which of the following can be inferred from the text?
A. It rained heavily on Christmas Eve.
B. Ann handed gifts to Ashley one by one.
C. Ashley hoped she would help someone else in need.
D. A good deed can influence many people’s behavior.
60. What would be the best title for the text?
A. A Young Girl’s Gift
B. A Mother’s Love
C. A Story of Young Girl
D. An Unknown Donor
查看答案和解析>>
科目:高中英語 來源:2009年普通高等學(xué)校招生全國統(tǒng)一考試浙江卷英語試題 題型:閱讀理解
Plants can’t communicate by moving or making sounds, as most animals do. Instead, plants Produce volatile compounds, chemicals that easily change from a liquid to a gas. A flower’s sweet smell, for example, comes from volatile compounds that the plant produces to attract insects such as Bugs and bees.
Plants can also detect volatile compounds produced by other plants. A tree under attack by Hungry insets, for instance, may give off volatile compounds that let other trees know about the Attack. In response, the other trees may send off chemicals to keep the bugs away ——or even Chemicals that attract the bugs’ natural enemies.
Now scientists have created a quick way to understand what plants are saying: a chemical Sensor(傳感器)called an electronic nose. The “e-nose” can tell compounds that crop plants make When they’re attacked Scientists say the e-nose could help quickly detect whether plants are being Eaten by insects. But today the only way to detect such insects is to visually inspect individual Plants. This is a challenging task for managers of greenhouses, enclosed gardens than can house Thousands of plants.
The research team worked with an e-nose than recognizes volatile compounds. Inside the device, 13 sensors chemically react with volatile compounds Based on these interactions, the e-nose gives off electronic signals that the scientists analyze using computer software.
To test the nose, the team presented it with healthy leaves from cucumber, pepper and tomato plants, all common greenhouse crops. Then scientists collected samples of air around damaged leaves from each type of crop, These plants had been damaged by insects, or by scientists who made holes in the leaves with a hole punch(打孔器). The e-nose, it turns out, could identify healthy cucumber, pepper and tomato plants based on The volatile compounds they produce, It could also identify tomato leaves that had been damaged. But even more impressive, the device could tell which type of damage ---- by insects or with a hole Punch ---- had been done to the tomato leaves.
With some fine-tuning, a device like the e-nose could one day be used in greenhouses to quickly spot harmful bugs, the researchers say. A device like this could also be used to identify fruits that are perfectly ripe and ready to pick and eat, says Natalia Dudareva, a biochemist at Purdue University in West Lafayette, Ind. who studies smells of flowers and plants. Hopefully, scientists believe, the device could bring large benefits to greenhouse managers in the near future.
【小題1】We learn from the text that plants communicate with each other by____.
A.making some sounds | B.waving their leaves |
C.producing some chemicals | D.sending out electronic signals |
A.They presented it with all common crops. |
B.They fixed 13 sensors inside the device. |
C.They collected different damaged leaves. |
D.They made tests on damaged and healthy leaves. |
A.pick out ripe fruits |
B.spot the insects quickly |
C.distinguish different damages to the leaves |
D.recognize unhealthy tomato leaves |
A.is unable to tell the smell of flowers |
B.is not yet used in greenhouses |
C.is designed by scientists at Purdue |
D.is helpful in killing harmful insects |
查看答案和解析>>
科目:高中英語 來源:2013-2014學(xué)年安徽省高二上學(xué)期期中檢測(cè)英語試卷(解析版) 題型:閱讀理解
For thousands of years, mankind has produced plants and animals to create more desired and useful plants and animals. For example, modern com has been produced to such a large size that it is no longer able to reproduce without man’s assistance. Modern dairy cows produce too much milk and if they are not often emptied of milk, they could leak, burst, become infected, and possibly die. Besides, most dogs raised by people can not survive in the wild even with special training.
Since natural evolution is extremely slow and mankind’s selective production programs only take a few generations to produce a completely new species, natural evolution has already taken a back seat to mankind’s production programs. In addition, mankind has successfully killed off several species all together. For example, there are no more European wolves in existence and mammoths (猛犸象) probably died out because of mankind. Even certain diseases have been permanently got rid of from the planet, and dozens of other diseases will soon be too. Again, natural evolution did i»t cause most of the destruction during man’s rule of the world.
Currently, scientists are creating new species with desired characteristics in the lab significantly faster than natural evolution creates new species. In a single generation, new species can be created and destroyed by mankind, while natural evolution could take thousands of years to do the same but only accidentally. Scientists are even able to replace defective (有缺陷的) or damaged genes with different genes to attempt to cure genetic defects. This is something that natural evolution could possibly never correct.
Eventually scientists will even be able to improve the quality of people. For example, imagine not only correcting your eyesight with gene treatment, but also ensuring that all of your children do not receive your old genes of poor eyesight too. Scientists will one day be able to improve the memory and intelligence of your children, so that they will do better in school and achieve more in life. Doctors and scientists will be able to customize (訂制) babies before they are born just like picking options at a car store.
1.According to the first paragraph,______ .
A. man-made evolution has improved all species
B. man-made evolution has weakened some species
C man-made evolution can make up for all natural losses
D. natural evolution won’t happen without man’s assistance
2.What does the underlined part “taken a back seat to” in Paragraph 2 mean?
A. Become powerful assistance to.
B. Become a huge barrier to.
C Speeded up the process of.
D. Played a less important role than.
3.What does the third paragraph mainly talk about?
A. Why natural evolution happens so slowly.
B. The way scientists adopt to have genetic defects repaired.
C. The advantages of man-made evolution over natural evolution.
D. How scientists make use of man-made evolution to create new species.
4.What can we infer from the passage?
A. Near-sighted parents will be able to produce babies with good eyesight in the future.
B. Doctors and scientists will be responsible for mass production of babies in the future.
C. It is natural evolution that is to blame for the destruction of European wolves and mammoths.
D. Children can now have their memory and intelligence improved with the help of gene treatment.
查看答案和解析>>
百度致信 - 練習(xí)冊(cè)列表 - 試題列表
湖北省互聯(lián)網(wǎng)違法和不良信息舉報(bào)平臺(tái) | 網(wǎng)上有害信息舉報(bào)專區(qū) | 電信詐騙舉報(bào)專區(qū) | 涉歷史虛無主義有害信息舉報(bào)專區(qū) | 涉企侵權(quán)舉報(bào)專區(qū)
違法和不良信息舉報(bào)電話:027-86699610 舉報(bào)郵箱:58377363@163.com