Read the following article and select the best answer. Article: One baby born with a defective windpipe now has hope of breathing normally thanks to 3-D printing technology, NPR reported. Garrett Peterson, now 18 months old, was born with tracheomalacia , leaving him unable to breathe. The condition terrified his parents, who turned to specialist Dr. Glenn Green at the University of Michigan for a possible treatment. Along with Scott Hollister, a biomedical engineer who runs the university's 3-D printing lab, Green designed a device that can hold open Garrett's windpipe until it's strong enough to function independently. After taking a CT scan of Garrett's windpipe to make a replica of it, they made the "splint" with a 3-D printer. "It's like a protective shell that goes on the outside of the windpipe, and it allows the windpipe to be tacked to the inside of that shell to open it up directly," Green told NPR. On January 31, Garrett had his surgery. Surgeon Dr. Richard Ohye opened up Garrett's chest and saw that his windpipe had completely collapsed and one of his lungs was completely white -- a condition Ohye had only seen in dead bodies. After eight hours of surgery and careful placement of a splint on either side of Garrett's windpipe, it was time for the big test: What would happen when they let air flow through the windpipe into Garrett's lungs? Though he still remains in the hospital, Garrett has gotten stronger and needs less assistance breathing in the weeks since his surgery. His parents are overjoyed, saying he's starting to act more interactive and alert. As Garrett grows, the splint will expand and eventually dissolve in his body as his own windpipe strengthens enough to work independently. 3-D printing technology has allowed doctors to help patients in ways that they hope will continue to grow. "We're talking about taking something like dust and converting it into body parts," Green said. "And we're able to do things that were never possible before." Question: What does the author mainly talk about in the passage? - The introduction of 3-D printing technology by medical workers. - The development of 3-D printing technology by engineers. - The use of 3-D printing technology in saving a baby. - The Potential of 3-D printing technology in surgery.
The use of 3-D printing technology in saving a baby.

Read the following article and select the best answer. Article: How "Kangaroo" Became an Animal's Name Early in the 18th century, Captain Cook, a famous explorer of Australia, unexpectedly saw an unusual animal during his first visit to Australia. The animal had a large mouth-like head and jumped along on its large legs. To his surprise, the unusual animal carried its baby in a special pocket of flesh. Captain Cook pointed to the animal which was eating grass in the distance and asked his local guide what that animal was. The guide seemed not to know what he was pointing at and finally said Kang-a-roo. Cook carefully wrote down Kang-a-roo as the animal's name in his word book. The Europeans who later got to Australia were anxious to see the unusual animal "Kang-a-roo", but their requests met with puzzled looks of the local people. Before long they got to discover that the local guide who made the answer to Cook's question really meant, "I don't know what you are pointing at." Funny enough, the name "Kang-a-roo" stuck and it is still in use today. Question: When the local guide said "Kang-a-roo" he really meant _ - "Ah, it is a special kind of animals." - "I wonder what you have said." - "I have no idea of what you are pointing at." - "What do you mean by pointing at that animal?"
"I have no idea of what you are pointing at."

Q: Read the following article and select the best answer. Article: For a commuter rushito catch a train, a minute can mean the difference between dinner with the family and foods in the microwave. What most passengers don't realize is that their minute is already there. Every commuter train that departs from New York Cityabout 900 a d leaves a minute later than scheduled. If the timetable says 8:14, the train will actually leave at 8:15.In other words, if you think you have only a minute to get that trainwell, relax. You have two. The courtesy minute , in place for decades and published only in private timetables for employees, is meant for those who need the extra time to get off the platform and onto the train. "If everyone knows they get an extra minute, they're going to waste time doing unimportant things," explained Marjorie Anders, a spokeswoman for the Metro-North Railroad. Told of this article, Ms. Anders laughed. "Don't blow our cover!"she said. Entirely hidden from the riding public, the secret minute is an odd departure from the railroad culture of down-to-the-second accuracy. The railroad industry helped invent the concept* of standard time, and time zones were established in the United States in the 1880s, 35 years before they were written into law. And most commuters know their train by the accurate minute it departs. The trains quickly make up the minute:at all other stops, the public timetable is carried out. The courtesy minute does not exist at commuter railroads in Chicago, Los Angeles, Philadelphia, or San Francisco. But in New York, the secret minute dates back decades. "That's been done forever, from my knowledge," said Jack Swanberg, 70, an unofficial historian of Metro-North. "I was the trainmaster starting in 1970 and I'm sure it's been the case since 1870 for all I know." Question: What can we conclude from the passage? - The courtesy minute exists in many cities in the US. - The train will reach the destination one minute late. - .Most railroad staff in New York know the courtesy minute. - In American rail system, train's departure time is accurate to the minute.
A: .Most railroad staff in New York know the courtesy minute.

(Q).
Read the following article and select the best answer. Article: Happy birthday! Do birthday really make people happy? Of course they do. _ Birthdays celebrate the day when we were born. Besides, that extra candle on the cake suggests another year of growth and maturity --or so we hope.We all like to imagine that we are getting wiser and not just older.Most of us enjoy seeing the wonder of growth in others, as well.For instance, seeing our children develop and learn new things makes us feel proud.For Americans, like people in most cultures, growing up is a wonderful process.But growing old? _ That is a different story. Growing old is not exactly for people in youth-oriented American culture.Most Americans like to look young, act young and feel young. As the old saying goes, "You're young as you feel." Older people joke about how many years young they are, rather than how many years old.People in some countries value the aged as a source of experience and wisdom.But Americans seem to favor those who are young, or at least "young at heart". _ Economically, "senior citizens" often try just to get by.Retirement at the age of 65 brings a sharp decrease in personal income.Social security benefits usually cannot make up the difference.Older people may suffer from poor nutrition , medical care, and housing. Some even have the experience of age discrimination . American sociologist Pat Moore once dressed up like an older person and wandered city streets.She was often treated rudely--even cheated and robbed.However, dressed as a young person, she received much more respect. Unfortunately, the elderly population in America is increasing fast.Why? People are living longer.Fewer babies are being born.And middle-aged "baby boomers" are rapidly entering the group of the elderly.America may soon be a place where wrinkles are "in".Marketing experts are already noticing this growing group of consumers. Question: Growing up is a wonderful thing because _ . - people can celebrate their birthdays. - people can become more and mature and wiser. - people can receive many presents. - people will feel younger at heart.
(A).
people can become more and mature and wiser.