Q: Read the article and select the best answer. Article: 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   ones. Natural leaves are able to change sunlight and water into energy. It is known as photosynthesis  .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  .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   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... Question: The main idea of this passage is   _  . Options: 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
A: D


Q: Read the article and select the best answer. Article: GENEVA, Feb.11 (Xinhua) --The current La Nina weather phenomenon may just be a partial cause of south prefix = st1 /China's freeze-up at the start of 2008, said the United Nations World Meteorological Organization (WMO) Monday. The latest La Nina pattern, which began in the third quarter of 2007, has picked up strength in the past three months, with sea surface temperatures now about 1. 5 to 2 degrees Celsius colder than average over large parts of the eastern and central equatorial Pacific Ocean, said the latest report issued by the WMO. Presenting the Geneva-based body's report, Rupa Kumar Killi, a WMO climate expert, said the recent month-long snow and ice-storms in China's central, southern and eastern regions could be connected with the La Nina phenomenon, the climatic opposite of El Nino . However, he said China's freeze-up was a result of several causes combined and was partly caused by a cold surge from the north and west. He also said the present La Nina cycle may last at least until mid-2008 and it is also possible, if less likely, that the cycle could stretch into the third quarter. La Nina is a large pool of unusually cold water in the equatorial Pacific that develops every few years and influences global weather. It is the climatic opposite of El Nino, a warming of the Pacific, and both have been associated with extreme weather around the globe. Since Jan. 10, snow, sleet and low temperatures have swept China's southern regions, a rare occurrence for the area. Question: What is the best title of the passage? Options: A: La Nina May Be a Partial Cause of China's Freeze-Up. B: La Nina and El Nino. C: What Causes the La Nina Weather Phenomenon? D: How La Nina Destroys the Whole World's Weather?
A: A


Q: Read the article and select the best answer. Article: The key to happiness is how quickly you can get back your focus on what`s important. ----Anonymous Sixteen years ago I learned this lesson in the back of a New York City taxi cab. Here`s what happened. I hopped in a taxi,and we took off for Grand Central Station. We were driving in the right lane when,all of a sudden,a black car jumped out of a parking space right in front of us. My taxi driver slammed on his brakes,skidded,and missed the other car`s back end by just inches! The driver of the other car,who almost caused a big accident,started yelling bad words at us. My taxi driver just smiled and waved at the guy. And I mean,he was friendly.  So,I said,"Why did you just do that?This guy almost ruined your car and sent us to the hospital!"And this is when my taxi driver told me what I now call "The Law of the Garbage Truck. " Many people are like garbage (rubbish)trucks. They run around full of garbage,full of frustration, full of anger,and full of disappointment. As their garbage piles up,they need a place to dump it. And if you let them,they`ll dump it on you. When someone wants to dump on you,don`t take it personally. You just smile,wave,wish them well,and move on. You`ll be happy with what you did. I started thinking,how often do I led Garbage Trucks run right over me?And how often do I take their garbage and spread it to other people at work,at home,or on the streets?It was that day I said,"I`m not going to do anymore. " Successful people do not let Garbage Trucks take over their day. What about you?If you let more garbage trucks pass you by,you`ll be happier. Life`s too short to wake up in the morning with regrets. So,Love the people who treat you right. Forget about the ones who don`t. Question: According to the passage,what should you do if people "dump garbage" on you? Options: A: Ignore them and go on with our own work. B: Try our best to persuade them not to do that again. C: Tell them to dump the garbage in the right place. D: Take over their work and carry the garbage to somewhere else.
