Imagine this: you get up in the morning and put on a custom printed T-shirt. Then you eat some 3-D printed food and relax on your printed sofa. Perhaps you take a ride in a printed electric car to the hospital to get a printed tooth fitted. Though some of these things may seem impossible, they're closer to reality than you might think. The world of 3-D printing is coming to a store near you soon. The idea of 3-D printing is to produce complicated shapes in a very personalized way. If you want to make a totally new object, you need to make a virtual design in a CAD(computer aided design)file first. Or you can use a 3-D scanner to make a digital copy of an object. Then, based on the design or copy, the 3-D printer makes paper-thin slices out of liquid, plastic, or metal and puts them together to create the object you want. There are many areas in which 3-D printing can change our lives. One such area is health care. Researchers have developed simple 3-D printed organs, which can be used in life-saving operations. A 17-year-old boy in the US has also recently developed a brain-powered, 3-D printed replacement hand. From heart monitors to fake limbs , we can soon be living longer thanks to 3-D printed technology. Another area that 3-D technology looks sure to change is food. Can you imagine being able to print your favorite dishes at home at the touch of a button? Even big companies are behind the trend. Hersheys, one of the largest chocolate makers in the world, recently announced that it would start producing chocolate with the help of 3-D printers. NASA, the US space agency, has reportedly spent $125,000 (767,594 yuan) developing a "3-D pizza printer". It is not yet clear how long it will take until 3-D printers are available to everyone. But one thing is for sure: the possibilities are endless. What can be the best title for the text? A) What is 3-D printing? B) A new technology-3-D printing. C) How to use 3-D printing? D) The development of 3-D printing.
B
A study has found, spending hours playing violent video games prevents teenagers from their moral growth. It is thought that regular touch to violence and lack of contact with the outside world makes it harder for them to tell right from wrong.They also struggle to trust other people,and see the world from their viewpoints. Researchers from Brock University in Ontario found that those who spend more than three hours each day in front of the screen are particularly unlikely to have developed the ability to empathize . The Canadian researchers surveyed 109 boys and girls,aged 13 and 14,about whether they played video games,which games they liked,and how long they spent playing them.Their findings found that 88 percent of teens said they played games,and more than half admitted to playing games every day.Violent games were among the most popular. The teenagers also filled in a questionnaire designed to measure their moral development.For example,they were asked how important it is to save the life of a friend. Previous studies have suggested that a person's moral judgment goes through four phases as they grow from children and enter adulthood.By the age of 13 or 14,scientists claim young people should be entering the third stage,and be able to empathize with others and take their viewpoints into account.The research found that this stage appeared to be delayed in teenagers who regularly played violent video games. It is also thought that teenagers who play games regularly did not spend enough time in the real world to learn to take others' thoughts into consideration.Researcher Mirjana Bajovic said:"The present results indicate that some teenagers, who spent three or more hours a day playing violent video games,are deprived of such opportunities." he added:"Touch to violence in video games may influence the development of moral reasoning because violence is not only presented as acceptable but is also justified and rewarded." They concluded that rather than trying to enforce an 'unrealistic' ban on the... Why did the Canadian researchers carry out the studies? A) To develop teenagers' ability to communicate. B) To enrich teenagers' awareness of social life. C) To discuss how to save the life of a friend. D) To measure teenagers' moral development.
D
Q: What makes a house a home? A home is a place of companionship with people in it who love each other, who are harmonious and closer with one another than with in the workplace or with classmates at school. A home is a place that's so magnetic that it's difficult to leave. In a home there is love, sharing and appreciation, and the members help one another. I have seen families on the street. But if they live, sleep, talk, and eat together, they are a family, even if they are poorly off. You don't need a roof to make a home. The truly homeless are some of the rich people who build multi-million-dollar houses and are too busy to really live in them. The truly homeless are those who have turned their home into a hotel lobby. The parents work and the children misbehave. They don't talk and eat together every day. They rarely see each other. The truly homeless people are those with babysitters, caretakers, gardeners and maids. However, people are unaware of this, as they are too busy making money outside the home that they don't live in. This is another way of looking at the rich and the homeless. Who is to be pitied? Control of the computer and the Internet is also important to make a house into a home. If the computer is on all the time, the house turns into an office, even if everyone is at home. Many homes these days are just offices. Human communication has stopped. The computer eats up all the time that one should be giving to others within the home. Using the computer moderately gives us time for play and communication, not with a screen, but with other people. According to the passage, which is NOT mentioned as an element of a home? A) Communication. B) Appreciation. C) Kindness. D) Companionship.
A: C
(Q).
On May 23rd the United States Department of Agriculture will meet to discuss the pressing topic of wild pigs. These beasts, which number 6 million or so, are an increasing bother. At their worst, they can damage crops, spread diseases, attack humans and kill farm animals. And things are getting worse: a study show that they are likely to double in number over the next 3 years. Why is it so hard to control wild pigs? Introduced to America in the 16th century, and related to the wild pigs found in Europe, wild pigs can be found in 75% of all states. No single law exists to control them and regulations differ between states: while in Missouri they can only be shot if met by chance, in Texas hunting is actively encouraged. A "pork chopper" law allows Texan hunters to shoot wild pigs from helicopters, and some people in Louisiana have even built their own pighunting drone . As well as being popular with hunters, wild pigs are cheaper for game raisers to breed than deer. In Michigan and Pennsylvania suggested bans on the private breeding of pigs for hunting have caused quarrels between game raisers and wildlife officials. Wild pigs' double nature----considered pests by farmers, but valued by hunters----makes it hard to pass laws to control them. Two other factors also contribute. Nearly 70% of land in America is privately owned. And it is difficult for lawmakers to impose breeding and hunting laws on private landowners. Secondly, it is hard to define a wild pig. In some states, laws are being introduced to redefine the term "wild animal" to keep out wild pigs. This is good news for those raising pigs for hunting, but less are to those who consider them pests whose number should be limited. Meanwhile, discussions continue over how to deal with this problem. Which is NOT the reason for the difficulty in controlling wild pigs? A) The difficulty of passing effective laws. B) The high percentage of land owned privately. C) The farmers' unwillingness to shoot wild pigs. D) The popularity of raising wild pigs in many states.
(A).
D