The nation's largest group of pediatricians on Monday urged its members to "firmly oppose boxing for any child or adolescent." In a statement, the American Academy of Pediatrics (AAP) said thousands of boys and girls take part in the sport in North America, despite risks of serious brain and facial injuries. The group's position was approved by some experts. "There is very little one can do in order to increase the chance of having a healthy brain when you get old," said Dr. Hans Forstl, who has studied boxing injuries. " One of the best things you can do is avoid boxing." He said. According to the new statement, published in the journal Pediatrics, information from Canada shows a rise in boxing injuries over the past decade. Pat Russo, a retired police officer who runs a boxing gym in Brooklyn, New York, said injuries are rare in amateur boxing. After 26 years and training thousands of kids, he has seen just one split lip among his students. " If the gym is run properly, injuries are at an absolute minimum," Russo said. "Football is ten times more dangerous. While tennis or football might also help kids gain confidence, boxing holds a special attraction for children in poor neighborhoods, because it allows them to act tough while in trouble." Dr. Robert Cantu, a surgeon at Emerson Hospital in Concord, Massachusetts, said AAP's attitude makes sense for upper-class and middle-class kids. " Clearly boxing is safer today than it was 20 or 30 years ago, but it is still a very risky activity," he said. "For kids in poor areas, however, the situation is different," said Cantu. " The most dangerous thing for the majority of people in boxing is just where they live. They are far safer in the ring , even taking blows to the head, than they are out in the neighborhood." Pat Russo believes that boxing injuries are _ . A) still on the rise today B) not a serious problem in his gym C) not common in poor neighborhood D) more dangerous than football injuries
B
(Question)
Imagine that you are sitting in a park and suddenly remember that you need to send an urgent email. You have your laptop computer with you and you connect it to a wireless access point and access the Internet. Then you send your email. This wouldn't have been possible if there were no wireless Internet for laptops. Wireless Internet has come into our life in so many ways that we don't even realize what a necessary part it has become of our day-to-day lives. How do we connect to a wireless Internet service for laptop computers? There are two ways to do this. They are Wi-Fi connection and Bluetooth connection. Wireless networking is very easy. You just switch on the Wi-Fi button that has been provided in the laptop for Wi-Fi scanning. Once that is done, the computer will connect to the Internet. An interesting fact about Wi-Fi networking is that you can create a network between similar wireless equipment. Consider a situation where you and your friend both have Wi-Fi laptops, and there is some data you want to exchange. Traditional networking architecture demands that you have a wireless router . But the beauty of Wi-Fi networking technology is that you can set up a network between you and your friend's laptop, and share all the data you want. Broadband Internet connection is typically preferred by any user as it provides better speed for Internet surfing. Up until the invention of 3G mobile phones, Internet speed on mobile phones was very slow. 3G has the promise of changing the entire face of broadband technology. Just imagine browsing at speeds of more that 2MB per second. To give you a measure of the speed, 3G enables you to watch high quality live videos on the Internet. It is amazing to see how technology changes and the rate at which it changes. There may come a time when you may be able to browse using mobile wireless Internet for laptops anywhere in the world. What should we do to share some data with a friend through Wi-Fi networking? A) Use the same computer. B) Surf online. C) Have a wireless router. D) Set up a network.
(Answer)
D
Question: From furniture to jewelry, from the medical industry to civil engineering,three--dimensional printing can turn all sorts of ideas into objects. "I wanted to print large objects such as buildings,"said Behrokh Khoshnevis,professor of the University of Southern California.He planned to construct a house in 24 hours by applying 3D printing techniques,but he admitted there would be difficulties in meeting his goal. "For example,if you run out of ink while printing on paper,you will throw that paper away.But you cannot throw half completed buildings away if your material gets stuck,"he said.Although the printed house is not available to visit,there is a chance for people in Shanghai to see items printed in 3D. The Belgium-based company Materialize NV is currently holding a 3D printing exhibition in Shanghai that started in late 2012 and will continue until the middle of this year.The company is eager to show Asia what is possible with 3D printing. "All the pieces shown here are what cannot be made through traditional techniques. A good example of this customization is hearing aids More than l0 million people already use 3D printed hearing aids.all made according to the size of their ear."said Wim Michiels, executive vice-president at Materialise NV. "You can produce anything whenever and wherever you like.You don't need to set-up production lines for pieces that only need a limited amount of product.Setting up a production Line is a tot of work, takes a long time and is very expensive for a limited number of pieces" said Michiels. Kim Francois,managing director of Matcrialise China,said their European and American clients have at ready made the next step toward additive manufacturing with small-series production such as hearing aids. According to Khoshnevis,what is the main difficulty in printing buildings? A) Time. B) Technique. C) Space. D) Material.
Answer:
D