Read the article and select the best answer. Article: Until recently, the "science of the future" was supposed to be electronics and artificial intelligence. Today it seems more and more likely that the next great breakthroughs in technology will be brought through a combination of those two sciences with organic chemistry and genetic engineering. This combination is the science of biotechnology. Organic chemistry enables us to produce marvelous synthetic materials. However, it is still difficult to manufacture anything that has the capacity of wool to conserve heat and also to absorb moisture. Nothing that we have been able to produce so far comes anywhere near the combination of strength, lightness and flexibility that we find in the bodies of ordinary insects. Nevertheless, scientists in the laboratory have already succeeded in "growing" a material that has many of the characteristics of human skin. The next step may well be "biotech hearts and eyes" which can replace diseased organs in human beings. These will not be rejected by the body, as is the case with organs from humans. The application of biotechnology to energy production seems even more promising. In 1996 the famous science fiction writer, Arthur C. Clarke, many of whose previous predictions have come true, said that we may soon be able to develop remarkably cheap and renewable sources of energy. Some of these power sources will be biological. Clarke and others have warned us repeatedly that sooner or later we will have to give up our dependence on non-renewable power sources. Coal, oil and gas are indeed convenient. However, using them also means creating dangerously high levels of pollution. It will be impossible to meet the growing demand for energy without increasing that pollution to catastrophic levels unless we develop power sources that are both cheaper and cleaner. It is attempting to think that biotechnology or some other "science of the future" can solve our problems. Before we surrender to that temptation we should remember nuclear power. Only a few generations ago it seemed to... Question: The materials produced with organic chemistry are _ .at present. Options: A: as good as wool B: as good as an insect's body C: better than natural materials D: not as good as natural materials
D

(Question)
Read the article and select the best answer. Article: Researchers found that people become happier and experience less worry after they reach the age of fifty. In fact, they say by the age of eighty-five, people are happier with their life than they were when they were eighteen years old. The findings came from a survey of more than three hundred forty thousand adults in the United States. The Gallup Organization questioned them by telephone in two thousand eight. At that time, the people were between the ages of eighteen and eighty-five. The researchers asked questions about emotions like happiness, sadness and worry. They also asked about mental or emotional stress. Arthur Stone in the Department of Psychiatry and Behavioral Science at Stony Brook University in New York led the study. His team found that levels of stress were highest among adults between the ages of twenty-two and twenty-five. The findings showed that stress levels dropped sharply after people reached their fifties. Happiness was highest among the youngest adults and those in their early seventies. The people least likely to report feeling negative emotions were those in their seventies and eighties. The findings appeared in the Proceedings of the National Academy of Sciences. Researchers say they do not know why happiness increases as people get older. One theory is that, as people grow older, they grow more thankful for what they have and have better control of their emotions. They also spend less time thinking about bad experiences. Professor Stone says the emotional patterns could be linked to changes in how people see the world, or maybe even changes in brain chemistry. The researchers also considered possible influences like having young children, being unemployed or being single. But they found that influences like these did not affect the levels of happiness and well-being related to age. The study also showed that men and women have similar emotional patterns as they grow older. However, women at all ages reported more sadness, stress and worry than men. Question: According to the researchers, what is probably the reason why people grow happier when they get older? Options: A: When people get older, they can't remember bad experiences. B: When people get older, they have no young children to care about. C: When people get older, they don't care about their feelings. D: When people get older, they learn to adjust their feelings.
(Answer)
D

Read the article and select the best answer. Article: When I was fourteen, I earned money in the summer by cutting lawns , and within a few weeks I had built up a body of customers. I got to know people by the flowers they planted that I had to remember not to cut down, by the things they lost in the grass or struck in the ground on purpose. I reached the point with most of them when I knew in advance what complaint was about to be spoken, which request was most important. And I learned something about the measure of my neighbors by their preferred method of payment: by the job, by the month--or not at all. Mr. Ballou fell into the last category, and he always had a reason why. On one day, he had no change for a fifty, on another he was flat out of checks, on another, he was simply out when I knocked on his door. Still, except for the money apart, he was a nice enough guy, always waving or tipping his hat when he'd seen me from a distance. I figured him for a thin retirement check, maybe a work-related injury that kept him from doing his own yard work. Sure, I kept track of the total, but I didn't worry about the amount too much. Grass was grass, and the little that Mr. Ballou's property comprised didn't take long to trim . Then, one late afternoon in mid-July, the hottest time of the year, I was walking by his house and he opened the door, mentioned me to come inside. The hall was cool, shaded, and it took my eyes a minute to adjust to the dim light. "I owe you," Mr Ballou said, "but..." I thought I'd save him the trouble of thinking of a new excuse. "No problem. Don't worry about it." "The bank made a mistake in my account," he continued, ignoring my words. "It will be cleared up in a day or two. But in the meantime I thought perhaps you could choose one or two volumes for a down payment. He gestured toward the walls and I saw that books were stacked everywhere. It was like a library, except with no order to the arrangement. "Take your time," Mr. Ballou encouraged. "Read, borrow, keep, or find something you like. What do you read?" "I don't know." And I... Question: The author found the first book Mr. Ballou gave him _ . Options: A: light-hearted and enjoyable B: dull but well written C: impossible to put down D: difficult to understand
C