Read the article and select the best answer. Article: Between 1996 and 2010, according to a study published in 2012, the use of computed tomography (CT) scans nearly increased by three times as much, from 52 scans per 1,000 patients to 149 scans per 1,000 patients. And those images certainly provided valuable information to help doctors diagnose hidden conditions that wouldn't have been possible without the added insight. But CT scans produce those detailed images using small amounts of radiation, and while the risk of that exposure is small, on a population level, increased reliance on the scans could drive a slight bump in cancer risk from CT. That's exactly what the latest study, published in the British Medical Journal, found. It's the largest study to date -- involving 10.9 million Australians born between 1985 and 2005. A team of researchers from Australia and Europe studied the cancer rates of Australian patients from birth to 19 years old who had CT scans in early childhood, and compared them to those who did not receive the scans. Most of the cases were followed for 10 to 17 years, and by the end of the study period, 3,150 of the 680,000 patients exposed to CT scans during childhood and young adulthood developed cancer and 57,542 of the remaining participants, who were not exposed, developed cancer. Those who were scanned had a 24% greater risk of cancer than those who did not receive them, with the risk increasing by 16% for each additional CT. The risk was highest for children who received scans before age five; they showed a 35% increased chance of developing a cancer during the study period than those who weren't scanned at this age. That research is still ongoing, however, and in the meantime, doctors and patients are left to find the delicate balance between how necessary scans are to diagnose disease, and their potential risk of causing cancer, which, most experts say, is still very small. "All parties, including patients and families, need to work together to make sure that CT scans are limited to situations where there is a definite ... Question: Which might be a suggestion from the researchers of the study? Options: A: Patients should take a cautious attitude to CT scans. B: Hospitals should provide more CT scan services. C: Doctors should use CT scans to diagnose cancer. D: Young people should say no to CT scans.
A

Read the article and select the best answer. Article: How to make friends with people from a different culture? The rules are as follows: RULE 1: Appreciate the Person. Most Americans like to be recognized as individuals as someone special with unique characteristics and personalities. Therefore, never say, " You're from America so I want to be your friend." Also don't imply that the reason why you approached them is because you wanted someone to practice your English with. That turns people off. Instead try saying," You seem like a real nice and interesting person and I would like to get to know you better." This way, they are much more inclined to be friendly because you see them as a three dimensional person and appreciate them for who they are in the inside. And by doing so, you not only learn about America and practice your English, but also gain a real friend in the process. RULE 2:Quit Calling Us Foreigners. Please refrain from calling a foreigner a foreigner especially in his face. The word makes people feel like an outsider, and even unwelcome, suggesting separation and insurmountable differences, widening an already existing gap in the situation. When Americans travel, they rarely say, "I'm foreign to your place." They tend to say, "I'm new in town. I'm new here." The reason is because new and unfamiliar things can become old and familiar. But can foreign things become native? Aha? You catch my drift. RULE 3: Just Do It. Some students like to be told about American culture but are less interested in spending the time and the effort to actually experience it. As Americans always say, "Get your hands dirty." Until you have first hand and hands on experience, you'll never really know anything. Right? So whenever you have the opportunity to participate in American culture, don't just sit there and watch. Get up and get involved! RULE 4: Find that Common Language. Now I must stress the importance of finding a common language. By that I don't mean English, Chinese, German, French, etc. I mean finding something you have in common with... Question: American prefer to make friends with those who _ . Options: A: avoid talking about their homeland B: recognize their personalities C: obey rules of communicating with friends D: needn't practice English while playing together.
B

(Q).
Read the article and select the best answer. Article: Americans like to visit the national parks. In 1996, over 250,000,000 people visited areas which are managed by the National Park Service. Experts say that by 2012, 500,000,000 people per year will visit the parks. As a result, people are trying to think of ways to protect the parks from the crowds. The crowding of the parks has caused several problems. One is that there is not enough space for all of the people who want to use the parks. To deal with this problem, you may have to book your tickets a few months ahead of time. The Park Service may also raise entrance fees . Another problem caused by increased park use is pollution. Some garbage and waste can be cleaned up, and the cleanup can be paid for by increased entrance fees. To cut down on noise pollution and air pollution, the number of cars allowed in parks may be limited. If this happens, people may use buses to travel around the parks. Officials may also limit the use of jet-skis, snow-mobiles, motor-boats, and sightseeing helicopters and planes. The parks may also be in danger because of development that is going on around them. For example, around Yellow Stone Park, many hotels, golf courses, resorts, and other tourist attractions have been built. Some of these developments have effect on areas that are used by animals. People will have to learn to agree about ways to protect the parks. If they do not, there will soon be no reason to visit these national treasures. Question: What can be inferred from the passage? Options: A: High fees may probably keep some people out of parks. B: Helicopters and planes will not be used in parks any longer. C: The bus will become the only tool in parks in order to cut down pollution. D: National Park Service will always welcome as many visitors as possible.
(A).
A