题目内容
What will power your house in the future？Nuclear, wind or solar power？According to scientists at the Massachusetts Institute of Technology (MIT) in the US, it might be leaves — but artificial (人造的) ones.
Natural leaves are able to change sunlight and water into energy. It is known as photosynthesis (光合作用). Now researchers have found a way to imitate this seemingly simple process.
The artificial leaf developed by Daniel Nocera and his colleagues at MIT can be seen as a special silicon chip with catalysts (催化剂). Similar to natural leaves, it can split water into hydrogen and oxygen when put into a bucket of water. The hydrogen and oxygen gases are then stored in a fuel cell，which uses those two materials to produce electricity，located either on top of a house or beside the house.
Though the leaf is only about the shape of a poker card, scientists claimed that it is promising to be an inexpensive source of electricity in developing countries. “One can imagine villages in India and Africa not long from now purchasing an affordable basic power system based on this technology,” said Nocera at a conference of the American Chemical Society.
The artificial leaf is not a new idea. The first artificial leaf was invented in 1997 but was too expensive and unstable for practical use. The new leaf, by contrast, is made of cheap materials, easy to use and highly stable. In laboratory studies, Nocera showed that an artificial leaf prototype (原型) could operate continuously for at least 45 hours without a drop in activity.
The wonderful improvements come from Nocera’s recent discovery of several powerful, new and inexpensive catalysts. These catalysts make the energy transformation inside the leaf more efficient with water and sunlight. Right now, the new leaf is about 10 times more efficient at carrying out photosynthesis than a natural one. Besides, the device can run in whatever water is available; that is, it doesn’t need pure water. This is important for some countries that don’t have access to pure water.
With the goal to “make each home its own power station” and “give energy to the poor”，scientists believe that the new technology could be widely used in developing countries，especially in India and rural China.
1.Which of the following orders correctly shows how the artificial leaf is used to produce electricity?
a. artificial leaves split water into hydrogen and oxygen
b. the hydrogen and oxygen gases are stored in a fuel cell
c. the artificial leaves are put in water
d. the fuel cell uses hydrogen and oxygen to produce electricity
A. c, a, b, d B. c, b, a, d
C. b, c, a, d D. c, a, d, b
2.The purpose of the scientists at MIT in developing the new artificial leaf is to ________.
A. build up more power stations in the world
B. provide cheaper energy for developing countries
C. offer people in developing countries access to pure water
D. gain a deeper understanding of the photosynthesis process
3.The main idea of this passage is ________.
A. an introduction to the history of artificial leaves
B. a mixture of water power and solar energy
C. giving energy to the poor
D. an invention copying photosynthesis
1.A
2.B
3.D
【解析】
试题分析：这篇文章主要讲了麻省理工学院的科学家研发新的人造树叶，这项发明是复制光合作用的发明。
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考点：考查科学研究类阅读
千里马走向假期期末仿真试卷寒假系列答案Below are some interesting columns from a website:
Girl’s Crazy Historical Costumes Stella Ehrhart, a US third-grader, dresses up as a different historical figure every day before school—yes, you heard right! The 8-year-old has been coming to class in a different persona (人物) daily since the second day of second grade, when she showed up as American author Laura Ingalls Wilder. Stella gets ideas for what to wear from the book 100 Most Important Women of the 20th Century. However, in the past years she has also dressed up as fictional characters including Hermione Granger from Harry Potter. The eager student managed to get through the entire second grade without repeating herself, but now she is running out of ideas. The girl’s parents, who are both theater professionals, say they support their daughter’s “creativity”. Her mother told UK news website The Huffington Post, “She goes into her closet and just picks out what she wants each day.” Learning Soars How do you get a child’s early education off the ground? A head teacher in the Georgian city of Rustavi has found a unique way of creating an exciting learning environment. He has transformed a plane into a kindergarten. Gari Chapidze bought an old but functional Yakovlev Yak-42 from Georgian Airways and filled it with education equipment, games and toys, but left the cockpit (驾驶舱) untouched so it could be used as a play area. “The idea was to create a kindergarten where children go | with joy,” Chapidze, who runs the kindergarten, told AFP. “The children come in to the kindergarten with pleasure and cry when they have to go home. They are happy here,” he added. Taxi Driver Gets Lucky in Las Vegas Bright lights and big wins—this is what Las Vegas is known for, and even the taxi drivers here get lucky. Well, at least recently one did. Adam Woldemarim, 42, discovered $ 221,510 in the back of his van after a long day at work. The money was in a laptop case left between the seats of the Virgin Valley cab. What did Woldemarim do with the cash? He turned it in. The Ethiopian driver soon got a call from the case’s owner who, according to the Las Vegas Review-Journal, had “won big” and was on his way to the airport when he realized he had forgotten his winnings. Woldemarim was given a $ 2,000 reward. But it was reported that the driver’s fellow taxi drivers thought he should have got a lot more. Eat Crickets (蟋蟀) and Worms at a Museum The Academy of Natural Sciences in Philadelphia is putting on a night for meat eaters who want to try some unusual foods. It is hosting a cocktail party on Oct 27 called Cuisine from the Collections. The food on the menu is inspired by the exhibited specimen (标本) at the museum. The event is for adults only. Let’s hope they don’t get a stomach bug from all the insects! |
1.Stella Ehrhart gets ideas on how to dress up every day before school from ________.
A. Laura Ingalls Wilder B. a book
C. Hermione Granger D. her parents
2.Which of the following is the biggest problem Stella Ehrhart is facing?
A. She has to get through the entire second grade dressing up as others.
B. She finds her parents no longer offer her as much support as before.
C. She finds it hard to think of enough new figures to dress up.
D. She has difficulty dressing up without falling behind in study.
3.Yakovlev Yak-42 is a certain kind of ________.
A. school B. company C. toy D. plane
4.According to the passage, the van driver ________.
A. was lucky to win a laptop case after a long day at work
B. was on his way to the airport when he saw the money
C. was given a reward but not quite satisfied with the sum
D. discovered the money but didn’t keep it for himself