单选题Many of novelist Carson McCullers' characters are {{U}}isolated{{/U}} people. A. solitary B. gloomy C. feeble D. frugal

单选题A Gay Biologist Molecular biologist Dean Homer has blue eyes, light brown hair and a good sense of humor. He smokes cigarettes, spends long hours in an old laboratory at the US National Institute of Health, and in his free time climbs up cliffs and points his skis down steep slopes. He also happens to be openly, matter of factly gay. What is it that makes Homer who he is? What, for that matter, accounts for the talents and traits that make up anyone"s personality? Hamer is not content merely to ask such questions; he is trying to answer them as well. A pioneer in the field of molecular psychology, Homer is exploring the role genes play in governing the very core of our individuality. To a remarkable extent, his work on what might be called the gay, thrill-seeking and quit-smoking genes reflects how own genetic predispositions. That work, which has appeared mostly in scientific journals, has been gathered into an accessible and quite readable form in Homer"s creative new book, Living with Our Genes. "You have about as much choice in some aspect of your personality." Homer and co-author Peter Copeland write in the introductory chapter, "as you do in the shape of your nose or the size of your feet." Until recently, research into behavioral genetics was dominated by psychiatrists and psychologists, who based their most compelling conclusions about the importance of genes on studies of identical twins. For example, psychologist Michael Bailey of Northwestern University famously demonstrated that if one identical twin is gay, there is about a 50% likelihood that the other will be too. Seven years ago, Hamer picked up where the twin studies left off, homing in on specific strips of DNA that appear to influence everything from mood to sexual orientation. Hamer switched to behavioral genetics from basic research, after receiving his doctorate from Harvard, he spent more than a decade studying the biochemistry of a protein that cells use to metabolize heavy metals like copper and zinc. As he was about to turn 40, however, Hamer suddenly realized he had learned as much about the protein as he cared to. "Frankly, I was bored," he remembers, "and ready for something new." Homosexual behavior, in particular, seemed ripe for exploration because few scientists had dared tackle such an emotionally and politically charged subject. "I"m gay," Hamer says with a shrug, "but that was not a major motivation. It was more of a question of intellectual curiosity—and the fact that no one else was doing this sort of research."

单选题China does a lot of trade with many countries.

单选题She {{U}}eventually{{/U}} married the most persistent one of her admirers.

单选题Which of the following is said to be the most expensive and harmful?

单选题The main idea of the passage is to explain

单选题It's natural for us to {{U}}speculate{{/U}} about the reasons for their visit.

单选题It is not easy to remain {{U}}tranquil{{/U}} when events suddenly change your life. A. calm B. upset C. steady D. severe

单选题We cannot {{U}}exist{{/U}} without air, food or water. A. expand B. rise C. live D. quit

单选题They agreed to modify their policy.

单选题The company {{U}}recommended{{/U}} that a new gas station be built here. A. ordered B. insisted C. suggested D. demanded

单选题Throughout the year 1979, there was a sharply rising rate of inflation in the United States.A. grimlyB. steeplyC. constantlyD. roughly

单选题I don"t think Peter is too young to take care of the pet dog properly .

单选题Preferences Vary on Circumstances of Dying Among terminally (晚期) ill people, attitudes differing on what they think constitute a 1 or bad death, the results of a new study suggest. Dr. Elizabeth K. Vig of the University of Washington in Seattle and colleagues interviewed 26 men with 2 heart disease or cancer. The men were asked to describe good and bad deaths, and they also answered 3 about their preferences for dying. In this small study, terminally ill men described good and bad deaths 4 , Vig said. They did not hold the same views about such issues 5 the presence of others at the very end of life or preferred location of death. Many of the men considered 6 in their sleep to be a good death. The reasons were varied and included not 7 that death was imminent (即将发生的), and that death would be painless. For close to half of the men, a prolonged (拖延的) death was 8 a bad death. Some of the men associated a prolonged death with prolonged pain, 9 others thought a prolonged death would be difficult for their families. Most men said that their 10 were very important to them, but this did not mean that they wanted relatives close at the 11 of death. "Valuing family did not also 12 wanting family present at the very end of life," Vig said. "In fact, some expressed concerns 13 burdening loved ones," Vig said. For instance, some men were worried about the emotional or 14 impact on their family members, according to the Washington researcher. Some were worried 15 their need for care would be a burden on their families, she said.

单选题Many factory workers find their jobs tiresome .

单选题People who do not sleep enough tend to become irritable. A. easily annoyed B. ill C. weary D. stiff and sore

单选题Are you {{U}}positive{{/U}} that there's been no mistake? A. rational B. reasonable C. certain D. bound

单选题Today, many countries are

单选题A red flag was placed there as a token of danger.

单选题The room is dim and quiet.