How can you find out what is going on inside a person's body without opening the patient's body up? Regular X rays can show a lot. CAT scans can show even more. They can give a complete view of body organs. What is a CAT scan? CAT stands for a kind of machine. It is a special X-ray machine that gets a 360-degree picture of a small area of a patient's body. Doctors use X rays to study and determine diseases and injuries within the body, X rays can find a foreign object inside the body or take pictures of some inside organs to be X-rayed. A CAT scanner, however, uses a group of X rays to give a cross-sectional view of a specific part of the body. A fine group of X rays is scanned across the body and around the patient from many different directions. A computer studies the information from each direction and produces a clear cross-sectional picture on a screen. This picture is then photographed for later use. Several cross sections, taken one after another, can give clear "photos" of the entire body or of any body organs. The latest CAT scanners can even give clear pictures of active, moving organs, just as a fast-action camera can "stop the action", giving clear pictures of what appears unclear to the eye. And because of the 360-degree pictures, CAT scans show clear and complete views of organs in a manner that was once only shown during operation or examination of a dead patient. Frequent appearance before X rays can cause skin burns, cancer or other damage to the body. Yet CAT scans actually don't cause the patient to more radiation than regular X rays do. CAT scans can also be done without getting something harmful into the patient, so they are less risky than regular X rays. CAT scans provide exact, detailed information. They can quickly find such a thing as bleeding inside the brain. They are helping to save lives. What is NOT true of a CAT scan? A) It is safer than regular X rays. B) It makes use of computer techniques. C) It can stop the action of an organ for a short time. D) It gives clear pictures of active, moving body parts.
C
(Question)
We don't have beds in the space shuttle, but we do have sleeping bags. During the day, when we are working, we leave the bags tied to the wall, out of the way. At bedtime we untie them and take them wherever we've chosen to sleep. On most space shuttle flights everyone sleeps at the same time. No one has to stay awake to watch over the space plane: the shuttle's computers and the enginers at the Control Office do that. If anything goes wrong. The computers ring a warning bell and the engineers call us on the radio. On the space shuttle, sleep-time doesn't mean nighttime. During each ninety-minute flight around the earth, the sun "rises" and shines through our windows for about fifty minutes: then it "sets" as our flight takes us around the dark side of the Earth. To keep the sun out of our eyes, we wear black sleep masks. It is surprisingly easy to get comfortable and fall asleep in space, and we sleep differently. Some sleep upside down, some sideways, some right side up. When it's time to sleep, I take my bag, my sleep mask, and my tape player with earphones and float up to the flight platform. Then I get into the bag, and float into a sitting position just above a seat, right next to a window. Before I pull the mask down over my eyes, I relax for a while, listening to music and watching the Earth go by under me. When I'm in space I don't need as much sleep as I do on Earth Maybe that's because when I am weightless, I don't feel as tired. Or maybe it's because I'm excited to be in space and don't want to waste time sleeping. During sleeping time, the job of watching over the shuttle is done by A) the shuttle's radio B) the shuttle's warning bell C) people working in the shuttle D) engineers at the Control Office
(Answer)
D
Ques: America's No.1 health problem? A report published by the American Institute of Stress claims the biggest threat to health today is neither cancer nor AIDS. The report says: "It has been estimated that75-90 percent of all visits to primary care physicians are for stress related problems" It is no exaggeration to say that people today are being attacked by stress. According to the National Consumers League, " Work is the top source of stress for adults who have problems and stress in their lives (39%),followed by family (30%).Other sources include health (10%), concern about the economy (9%)and concern about international conflict and terrorism (4%)." However , stress is hardly unique to the United States .A British survey in 2013 estimated that "over half a million individuals in Britain believed in 2012 that they were experiencing work -related stress at a level that was making them ill ." As a result of "work -related stress, depression or anxiety ,"there are "an estimated thirteen and a half million reported lost working days per year in Britain ."\ The picture is no less bleak in mainland Europe .According to the European Agency for Safety and Health at Work , "work-related stress has been shown to affect millions of European Workers across all types of employment sectors ." One survey revealed that there are "about 41 million workers affected by work-related stress each year." What about Asia ? A report issued by a conference held in Tokyo concluded: " Job stress is a common concern among many countries in the world , both developing and industrialized countries ." The report observed that "several countries in East Asia , including China and Korea, have rapidly industrialized and economically grown .These countries now have a lot of concerns on job stress and its harmful effects on workers' health." It is likely that you'll read this information in _ . A) Popular Science B) New York Medical News C) Daily Health Report D) Medicine and Healthcare Journal
Ans: D
Ques:Technology is changing our lives. Our present aerospace companies are gradually disappearing as private space concerns are being born every day. I'm going to discuss three spacebased businesses that are sure to soon influence us all. First we have to make space travel cheaply and safely. Engine design is the main challenge. To make money in space, the cost of space travel will have to diminish . This problem will be the most difficult to solve. Liquid fueled rockets are the only way to get out of Earth's orbit. Finding new ways to power the flight to space is also another big challenge. Finding the key to cheap space travel might be the biggest story of our times. There are a lot of great minds working on this problem. And companies are pouring money into research and development. In the next few years we'll see the first suborbital tourist. And not long after that we should really start to see new and exciting things as competition heats up. Spacecraft design and production will naturally follow rocket technology. All sorts of crafts will be needed for the wide uses they'll be tasked with. Several companies in the United States have already made small, lowcost test vehicles. Resources in space will provide great mining profits to those who can afford the cost of setting up such a huge operation. Can you imagine finding a huge asteroid of pure gold? The benefit to mankind is limitless. Mining on other planets, like Mars, also adds CO2 into the very thin atmosphere. Over time this can lead to the formation of an atmosphere similar to Earth's. Space is going to offer us untold opportunity and wealth. But this is only going to occur if wealthy investors step forward and fund the first steps forward. It is certain that technology will take us to worlds we could never have imagined. According to the passage, the spacebased businesses are _ . A) likely B) imaginary C) unbelievable D) valuable

Ans:
A