题目内容
6.Recently,researchers has announced a breakthrough in the exploration of new energy-development of the first practical artificial leaf,an advanced solar cell that imitates the process,called photosynthesis(光合作用),that green plants use to make sunlight and water into energy."A practical artificial leaf has been a dream of scientists for decades,"said Daniel Nocera,who led the research team."We believe we have made it.The artificial leaf shows particular promise as an inexpensive source of electricity for homes of the poor in developing countries.One can imagine villages in India and Africa soon purchasing an affordable basic power system based on this technology."
The leaf is like the shape of a poker card but thinner.Placed in water in a bright sunlight,it could produce enough electricity to supply a house in a developing country with electricity for a day by splitting water into hydrogen and oxygen,which are stored in a fuel cell to produce electricity.
The"artificial leaf"is not a new concept.The first artificial leaf was developed more than a decade ago by John Turner.However,it was impractical for wider use,as it was composed of rare,expensive metals and was highly unstable with a lifespan of barely one day.
Nocera's new leaf overcomes these problems.It is made of inexpensive materials that are widely available,works under simple conditions and is highly stable.Laboratory studies showed that it could operate continuously for at least 45hours without a drop in activity.
The key to this breakthrough is Nocera's recent discovery of several new powerful,inexpensive catalysts,which are able to accelerate the chemical reaction under simple conditions.Right now,Nocera's leaf is about 10times more efficient at carrying out photosynthesis than a natural leaf.Yet he is optimistic that he can boost the efficiency of the device much higher in the future.
24.Daniel Nocera describes his artificial leaf as promising inC.
A.making an artificial plant that can feed itself.
B.finding a new kind of catalyst to produce electricity.
C.providing electricity for the poor family at a low cost
D.changing the sunlight and water into electricity directly
25.According to the passage,The underlined word"accelerate"in the last paragraph probably meansB.
A.reduce the loss of energy
B.speed up the process
C.work as a media to store collected energy
D.control the operation of chemical reactions
26.We can learn from the passageB.
A.There was nobody who had an idea of the artificial leaf before.
B.Nocera's artificial leaf has advantages over Turner's in some ways.
C.The first artificial leaf was once widely put into use in many countries.
D.The new artificial leaf works well but can just keep operating only one day.
27.The passage is most probably fromA.
A.a science news report B.a science fiction story
C.a fairy tale book D.an advertisement for solar products.
分析 本文是一篇科教类阅读,主要讲的是研究者宣布了人造叶子新能源发展探索及一种模仿光合作用的高级太阳能细胞方面的突破.
解答 24-27.CBBA
24题答案:C考查细节推理,根据文章第二段的We believe we have made it.The artificial leaf shows particular promise as an inexpensive source of electricity for homes of the poor in developing countries.(我们相信我们做到了.人造叶子表现出了独有的希望--作为发展中国家贫困家庭的一种廉价的电力资源).可知本题答案为C选项.
25题答案:B考查细节推理,根据后面的Right now,Nocera's leaf is about 10times more efficient at carrying out photosynthesis than a natural leaf.(现在Nocera的叶子在光合作用方面比自然的叶子要快十倍).可知划线单词的意思是"加速",故本题答案为B选项.
26题答案:B考查细节推理,根据文章第五段的Nocera's new leaf overcomes these problems.(Nocera的叶子攻克了这些问题(这些问题指的是Turner的叶子材料是由稀有的、昂贵的金属合成;而且寿命很短)).可知本题答案为B选项.
27题答案:A考查推理判断,本文讲的是研究者宣布了人造叶子新能源发展探索及一种模仿光合作用的高级太阳能细胞方面的突破;这属于科学方面的,故本题答案为A选项.
点评 本文是一篇科教类阅读,题目涉及多道细节理解题,做题时结合原文和题目有针对 性找出相关语句进行仔细分析,结合选项选出正确答案.推理判断也是要在抓住关键句子的基础上合理的分析才能得出正确的答案.

Yu Gardens These famous Ming gardens are often rather crowded.Don't forget to try their delicious food. Open:9:30am-5:00pm. | Lu Xun's Museum This is a great place for book-lovers.There are photographs of the famous writer,some of his books written by hand and many letters.Very cheap. Open:9:00am-4:00pm. |
Shanghai Art Museum An interesting building,once used as a race club and library.Drop in and see the latest exhibition.There are shows by painters from all over the country. Open:9:00am-5:00pm. | Shanghai Natural History Museum Everything about the natural world and science.You can study dinosaurs,hundreds of animals,plants,rocks,and see many unusual exhibits.Very cheap. Open:9:00am-5:30pm. |
Shanghai Museum You must see this beautifully designed museum.It is a wonderful place to study Chinese art and history.There are old treasures,fantastic Chinese sculptures (雕刻),paintings from all ages and many other things for you to enjoy. Open:9:00am-5:00pm.(9:00am-8:00pm,Saturday) |
A.They make people love nature.
B.They cost very little to enter.
C.They have something nice to eat.
D.They are good for art research.
25.You can't studyA when you visit Shanghai Natural History Museum.
A. robots
B.dinosaurs
C.bamboo
D.rocks
26.If someone is interested in silver bowls of the Tang Dynasty,he can go toB.
A.Shanghai Art Museum
B.Shanghai Museum
C.Lu Xun's Museum
D.Shanghai Natural History Museum
27.How many museums with paintings are mentioned in the text?B
A.One.
B.Two.
C.Three.
D.Four.