Watching television makes it easier for toddlers to kick and scream, according to a U.S. study. Children under two should not watch any TV. The longer they sit in front of the box, the worse their behavior becomes. Just having the TV on in the background, even if the child wasn't watching it, was also connected to troublemaking behavior although the relationship wasn't as strong, said the researchers. "Parents should be smart about TV use," researcher Jennifer Manganello from the University at Albany, New York, said. "They should limit the time that children use TV, pay attention to the content of TV programs, and consider how TV is used throughout the home." The study looked at 3,128 women from 20 U.S. cities who had a child between 2005 and 2008. While there was some diversity of education among the women, one-third hadn't graduated from high school. Two-thirds of the mothers said their three-year-old watched more than two hours of TV a day, and the average viewing time for children was around three hours. On average, the TV was on for about five additional hours on a common day. After accounting for factors such as living in a violent neighborhood, scientists also found watching TV was strongly connected to behavior such as hitting others, having angry moods, being disobedient , and screaming a lot. The researchers thought that children may see violence on TV, and spend less time on positive development tasks such as reading or playing. The American Academy of Paediatrics suggests no TV at all for children at two and younger, and two hours a day or less for older kids. what is the main idea of the passage? A) Children should choose positive programs. B) Children should keep away from TV. C) Watching TV can make children violent. D) Parents should watch less TV.
C

Welcome to your future life!               You get up in the morning and look into the mirror. Your face is firm and young-looking. In 2035, medical technology is better than ever. Many people your age could live to be 150, so at 40, you're not old at all. And your parents just had an anti-aging   treatment. Now, all three of you look the same age !               You say to your shirt , "Turn red." It changes from blue to red. In 2035, "smart clothes" contain particles  much smaller than the cells in your body. The particles can be programmed to change clothes' color1 or pattern.               You walk into the kitchen . You pick up the milk ,but a voice says ," You shouldn't drink that!" Your fridge has read the chip   that contains information about the milk , and it knows the milk is old . In 2035, every article of food in the grocery store has such a chip .               It's time to go to work . In 2035, cars drive themselves. Just tell your "smart car" where to go. On the way , you can call a friend using your jacket sleeve . Such "smart technology" is all around you.               So will all these things come true? "For new technology to succeed," says scientist Andrew Zolli ,"it has to be so much better that it replaces what we have already." The Internet is one example---- what will be the next? We can learn from the text that in the future  _  . A) .people will never get old B) everyone will look the same C) . red will be the most popular color1 D) clothes will be able to change their pattern
D

One day, Mr. Arnold was teaching a lesson, and things were going as normally as ever. He was explaining the story of mankind to his pupils. He told them that, in the beginning, men were nomads; they never stayed in the same place for very long. Instead, they would travel about, here and there, in search of food, wherever it was to be found. And when the food ran out, they would move off somewhere else. He taught them about the invention of farming and keeping animals. This was an important discovery, because by learning to cultivate the land, and care for animals, mankind would always have food steadily available. It also meant that people could remain living in one place, and this made it easier to set about tasks that would take a long while to complete, like building towns, cities, and all that were in them. All the children were listening attracted by this story, until Lucy jumped up: "And if that was so important and improved everything so much, why are we nomads all over again, Mr. Arnold?" Mr. Arnold didn't know what to say. Lucy was a very intelligent girl. He knew that she lived with her parents in a house, so she must know that her family were not nomads; so what did she mean? "We have all become nomads again," continued Lucy, "The other day, outside the city, they were cutting the forest down. A while ago a fisherman told me how they fish. It's the same with everyone: when there's no more forest left the foresters go elsewhere, and when the fish run out the fishermen move on. That's what the nomads did, isn't it ? The teacher nodded, thoughtfully. Really, Lucy was right Mankind had turned into nomads. Instead of looking after the land in a way that we could be sure it would keep supplying our needs, we kept developing it until the land was bare. And then off we would go to the next place! The class spent the rest of the afternoon talking about what they could do to show how to be more civilized. The next day everyone attended class wearing a green T-shirt, with a message that said " _ " And , from... The writer tries to make us believe that   _  . A) mankind has been progressing mainly through traveling about B) it's unwise for mankind to use the land in an uncontrolled way C) it's quite good for students to learn more about the history of mankind D) in the beginning men were nomads.

B