Ques:Article: We've used the wind as an energy source for a long time. The Babylonians and Chinese were using wind power to pump water for irrigating crops 4,000 years ago, and sailing boats were around long before that. Wind power was used in the Middle Ages, in Europe, to grind corn, which is where the term "windmill" comes from. We can use the energy in the wind by building a tall tower, with a large propeller on the top. The wind blows the propellor round, which turns a generator to produce electricity. We tend to build many of these towers together, to make a "wind farm" and produce more electricity. The more towers, the more wind, and the larger the propellors, the more electricity we can make. It's only worth building wind farms in places that have strong, steady winds, although boats and caravans increasingly have small wind generators to help keep their batteries charged. The best places for wind farms are in coastal areas, at the tops of rounded hills, open plains and gaps in mountains - places where the wind is strong and reliable. Some are offshore. To be worthwhile, you need an average wind speed of around 25 km/h. Most wind farms in the UK are in Cornwall or Wales. Isolated places such as farms may have their own wind generators. In California, several "wind farms" supply electricity to homes around Los Angeles. The propellors are large, to obtain energy from the largest possible volume of air. The blades can be angled to cope with varying wind speeds. Some designs use vertical turbines , which don't need to be turned to face the wind. The towers are tall, to get the propellors as high as possible, up to where the wind is stronger. This means that the land beneath can still be used for farming. Question: We can infer from the passage that _ . Yes or no, is the answer "wind farms will not take up too much farming land"?

Ans:Yes
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Ques:Article: Peyton,an 11-year-old boy from Florida,has the enthusiasm of scientific invention and the-gift of Thomas Edison. The sixth-grader put his math and science skills as well as some real-life experience to use and created something that could benefit our world a lot ---- the sandless sandbag.Today he was named the winner of the Young Scientist Challenge for his sandbag. "I had a really terrifying experience with a hurricane," said Peyton."When I was 4,I experienced Hurricane Wilma.When it hit Florida in October 2005,my family and I crowded in a closet and watched the storm bring damage and death to our area,feeling terrible and hopeless." Saltwater flooding caused great damage,which made him think about how people can prepare for floods.Peyton,who has been solving math problems since he was 3,eventually came up with the sandless sandbag. "Instead of filling it with sand,I filled it with just the right amount of chemicals and salt,"he said."What's amazing is that when you pick these bags up and they're not wet,they only weigh a pound or two." Unlike regular sandbags,Peyton's is light and easy to carry.They only expand when doused with water.The bags are portable when dry and will not float away when wet. Experts praised his invention and said that the sandless sandbag could someday save a lot of lives and possessions."He understands the big picture.He thinks in terms of the influence on society and safety for the people around this area,"said Dr.Antonio,the engineering chairman at the University of Miami."We'd love to have him at our university." Peyton has to get through middle school and high school first,but until then,the young scientist will continue thinking and inventing. Question: when the sandless sandbag is wet,it will _ . Yes or no, is the answer "get heavy"?

Ans:Yes
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Ques:Article: Any introduction to Peking Opera would not be complete without telling of Mei Lanfang. During his stage life, he combined the traditions of the past with his own creations, shaping a style of his own and giving birth to "The Mei Lanfang School". He was also the first artist to introduce Peking Opera to an overseas audience, making it popular to the world. Mei Lanfang began his stage life at the age of 8. His teacher said he showed little hope because of his boring eyes. To improve this, he exercised them day after day. Thanks to his efforts, he managed to change his dull eyes into a pair of bright and expressive eyes and win national fame before the age of 20. In over 50 years on the stage, Mei Lanfang played no less than 100 different characters in the performance. He also wrote many new plays, designing the dances himself. The many dances he created form part of the great treasure that he left to Peking Opera. In 1930, Mei Lanfang started on a successful US tour. There his brilliant performances impressed the audience, making them realize that Peking Opera was a theatrical form of great value. Question: How long did it take Mei Lanfang to exercise his eyes into bright and expressive? Yes or no, is the answer "About 12 years."?

Ans:No
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Ques:Article: Last year, I met a little boy to whom my heart went out. He would talk to me every single day, and always seemed to have a smile on his face. His problem was that he stuttered extremely badly when he tried to talk. It was really hard to understand what he was saying, although he loved to tell big tales! One morning, I was talking to the teachers who ran the school store. The boy stopped by and said hello to all of us. Afterwards they told me that the boy would stop every day to ask if they would be there the next day. But of course, he never had money to buy anything. I decided that I would get him a little something just as a surprise. So I picked out a pencil, a rubber, and a small notebook for just $1.00. I cannot describe the look on his face when I gave him the three little things. Then, without a stutter, he loudly said, "Thank you so much!" and just kept repeating, "Thank you! Thank you!" He gave me a big hug before going off to class. I was touched to see someone appreciate something that much. As he walked off, he was showing his new stuff to other kids walking to class. I have to say that I have never spent a dollar that would me an so much to me. Question: Which would be the best title for the passage? Yes or no, is the answer "The Best Dollar I Have Spent"?

Ans:
No
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