Technology is the application of knowledge to production. Thanks to modern technology, we have been able to increase greatly the efficiency of our work force. New machines and new methods have helped cut down time and expense while increasing overall output. This has meant more production and a higher standard of living. For most of us in America, modern technology is thought of as the reason why we can have cars and television sets. However, technology has also increased the amount of food available to us, by means of modern farming machinery and animal breeding techniques, and has made our life span longer via medical technology. Will mankind continue to live longer and have a higher quality of life? In large measure, the answer depends on technology and our ability to use it widely. If we keep making progress as we have over the past fifty years, the answer is definitely yes. The advancement of technology depends on research and development, and the latest surveys show that the united States is continuing to put billions of dollars annually into such efforts. So while we are running out of some limited resources, we may well find technological substitutes for many of them through our research programs. Therefore, in the final analysis, the three major factors of production (land, labor and capital) are all influenced by technology. When we need new skills or techniques in medicine, people will start developing new technology to meet those needs. As equipment proves to be slow or inefficient, new machines will be invented. Technology responds to our needs in helping us improve our standard of living. According to the passage, people can live a long life with the help of _ . A) higher quality of life B) medical technology C) modem farming machinery D) technological substitute
B
(Question)
Butterflies are some of the most fascinating and beautiful insects in the world. Adult butterflies will live about 2 to 4 weeks. They use their senses of sight, touch, hearing, smell, and taste to survive in the world, find food and mates, lay eggs in an appropriate place, migrate, and avoid hungry enemies. Butterflies have large compound eyes , which allow them to see in all directions without turning their heads. Like most insects, butterflies are very nearsighted, so they are more attracted to a sea of flowers than individual plants. Butterflies do not "see" colors such as red, green, and yellow, but they can sense sunlight, which indicates the direction the sun is shining, as well as ultraviolet light , which is present on many flowers and guides butterflies to honey sources. Butterflies have a very well-developed sense of smell, but it is not in their nose, since they don't have one. Sense receptors are located in their antennae , feet, and many other parts of the body. They can help butterflies find their favorite flower honey food, and mates. Butterflies' feet have sense organs that can taste the sugar in flower honey, letting the butterflies know if something is good to eat or not. Some females also carefully choose host plants by tasting to find appropriate places to lay their eggs. Adult butterflies feed their babies using a long tube. Butterflies force blood into the tube to straighten it out, allowing them to feed. Butterflies get all their food from this tube. Butterflies don't have ears. Instead they "hear" sounds through their wings by sensing changes in sound vibrations . Butterflies may possess senses we don't even know about yet, because their body structure is very different from ours, and therefore difficult to understand, when observed through our own human senses. Why do female adult butterflies carefully choose the host plants? A) To find highqualified honey. B) To have a good place for living. C) To make it easier for them to hide from the enemies. D) To find a proper place for their eggs.
(Answer)
D
Ques: Nearly all of today's Native Americans in North, Central and South America can trace their ancestry to just six women whose descendants immigrated around 20,000 years ago, a DNA study suggests. The finding does not mean that only these six women gave rise to migrants who crossed into North America from Asia in the earliest population of the continent.Rather, it suggests that only six left a particular DNA legacy that persists to today in about 95% of Native Americans, said study co-author Ugo Perego in Utah. "The women did not necessarily arrive together, nor even all live at the same time," he said.Results indicate the women arrived sometime between 18,000 and 21,000 years ago. The work was published this week by the journal PLoS One.Perego is from the Sorenson Molecular Genealogy Foundation in Salt Lake City and the University of Pavia in Italy.The work confirms the previous indications of just six maternal lineages, as well as a date of around 20,000 years ago when the first people in North America arrived after crossing a land bridge from Asia, Perego said. The researchers studied mitochondrial DNA, which is passed only from mother to daughter.They created a "family tree" that traces the different DNA _ found in today's Native Americans.By noting mutations in each branch and applying a formula for how often such mutations arise, they calculated how old each branch was.That indicated when each branch arose in a single woman. The six "founding mothers" obviously did not live in Asia because the DNA signatures they left behind are not found there, Perego said.So they probably lived in Beringia, the now-submerged land bridge that stretched to North America, he said. What is the passage mainly about? A) A study indicates that women arrived in America around 20,000 years ago. B) A study indicates six women gave rise to migrants of America. C) A DNA study tells about people who crossed into North America from Asia. D) A study indicates Native Americans can trace their ancestry to just six women.
Ans: D
Ques:As Paige watched the other kids playing football in her local park she longed to join in. But at nearly nine stone (1stone equals 6.35 kilograms), the 11-year-old was too big to enjoy her favorite sport, she was well on her way to being another overweight member of her family. Mandy, her mum was 17th 10 lb and Anne, her grandma 15th 10 lb. Mandy, 39, and Anne, 67, both have a sweet tooth and share a love of all things stodgy. Recent figures show that two-thirds of kids will be dangerously fat by 2050, and overweight kids often become obese adults and live shorter lives as they are at higher risk of everything from heart disease to cancer and type-2 diabetes. Mandy says she knew things had to change for her and her family. Mandy's mum Anne had an even greater motivation for wanting to slim down. Last autumn Paige went along to the Slimming World to keep her mum and grand ma company. In the first week on the Slimming World eating plan, Mandy lost a whopping 9.5lb. Mandy asked Paige to join in. They believed the Free2Go plan is balanced and nutritious and doesn't deprive Paige of anything. Supporting and encouraging each other the whole time, Anne, Mandy and Paige all whittled away their waistlines. Mandy says: "My back problems have cleared up." Anne has also noticed a real difference in her health. She says: "I feel like I've got my old energy back." Paige is almost as delighted with her new wardrobe as she is about her foot balling skills. Mandy adds: "I'm just so proud of Paige. I felt awful because I knew her weight problems were a result of my bad eating habits. But when I see her now it's like she's a different person." Which of the following is TRUE according to the passage? A) Overweight people usually live longer. B) Free2Go plan can't make people healthy. C) Paige liked the game of football very much. D) Sweet food can make people suffer heart disease.

Ans:
C