单选题It is reasonable for people to pursue a career in fields related ____ their favorite hobbies.

单选题Is that 6 a.m. workout getting in the way of good sleep? Don"t think your fat cells won"t notice. A new study published in The Annals of Internal Medicine (a medical journal) finds that inadequate shut-eye has a harmful effect on fat cells, reducing their ability to respond to insulin (胰岛素) by about 30 percent. Over the long-term, this decreased response could set the stage for type-2 diabetes (a medical condition in which someone has too much sugar in his or her blood), fatty liver disease and weight gain. The study adds to a growing body of evidence that there"s "an intimate relationship between the amount of sleep we get and our ability to maintain a good, healthy body weight," says sleep expert Helene Emsellem, director of the Center for Sleep and Wake Disorders in Chevy Chase, Maryland. But Americans don"t seem to be getting the message that we need seven to nine hours per night. More than 1 in 5 of us, according to a report from the Centers for disease Control and Prevention, is getting six or fewer hours of sleep per night, on average. So how did researchers study fat cells in the Annals paper? Matthew Brady of the University of Chicago and a group of colleagues selected and persuaded seven volunteers to take part in the research project. They were all young, think and healthy and agreed to sleep for eight nights in a sleep lab. "For four nights they were allowed to stay in bed for 8.5 hours a night," says Brady. Then, a month later, they came back for four additional nights--but this time they were allowed just 4.5 hours of sleep per night. And after each visit, researchers got a sample of their fat. Brady explains that the fat cells responded significantly to the loss of sleep. "I was very surprised to be honest," he says. Bad things can happen when fat cells become less responsive to insulin. "Fat cells are actually your friend," he says. "They"re there to store lipids (血脂)." When lipids stay inside the cells, you body can utilize the fat when you"re exercising or sleeping or going about your day. "However, when fat cells start to become insulin resistant, the lipids start to leach out of the fat cells and rise in the bloodstream," Brady says.

单选题When Mr. Black retired, his son ______ the business.

单选题In 1950, Helena Rubinstein was one of the richest women in the world. She started with nothing. She had no money, no education, and no one to help her. All she had were 12 jars of face cream and a lot of energy and ambition. She turned them into a multimillion-dollar cosmetics (化妆品) empire. Helena Rubinstein was born in 1870 in Krakow, Poland. She was the oldest of eight girls. Helena"s mother thought that beauty was very important. She used a special skin cream that a foreign chemist made for her. Helena"s mother made all of her daughters use it too. Helena"s father wanted her to be a doctor. But she hated medicine and left school. Her father was very angry. Then he wanted her to get married, but she refused. In 1992, she went to Melbourne, Australia, to live with a cousin and an uncle. She took only her clothes and 12 jars of face cream. Helena didn"t speak English. She had no money and no plans. After she arrived, everyone noticed her beautiful skin. In Australia, the hot and dry weather is very bad for the skin. When she told some of the women about the face cream, they all wanted some. Helena sold them her cream and then ordered more. Helena borrowed $1,500 and opened a shop to sell the cream. (80) She worked 18 hours a day, seven days a week. She lived simply and saved all of her profits. She also learned how to make different kinds of creams and showed women how to take care of their skin. It was the first shop of this kind in the world. In less than two years, Rubinstein had paid her loan and saved $ 50,000. She made more and more money every year. All this time, she thought only of work and success. A newspaper reporter named Edward Titus was in love with her. But she was not interested in him. She left Australia and went to Europe to learn more about the science of beauty.

单选题He has already made up his mind. It's no use ______ him.

单选题Questions 6 to 10 are based on the following passage: Trees are useful to man in three very important ways: they provide him with wood and other products; they give him shade; and they help to prevent droughts (干旱) and floods. Unfortunately, man has not realized that the third of these services is the most important. Two thousand years ago a rich and powerful country cut down its trees to build warships, with which to gain itself an empire (帝国). It gained the empire, but, without its trees, its soil became hard and poor. When the empire fell to pieces, the home country found itself threatened by flood and starvation. (77) Even though a government realizes the importance of a plentiful supply of trees, it is difficult for it to persuade villagers to see this. The villagers want wood to cook their food with; and they can earn money by selling wood. They are usually too lazy to plant and look after the trees. (78) So, unless the government has a good system of control, or can educate the people, the forests will slowly disappear. This does not only mean that the villagers' children and grandchildren will have fewer trees. The results are even more serious, for where there are trees their roots break the soil up, allowing the rain to sink in, and also bind the soil, thus preventing its being washed a-way easily. But where there are no trees, the rain falls on hard ground and flows away from the surface, causing flood.

单选题We can't______one to change the habits of a lifetime in a short time.

单选题In contrast to the earlier linguists, modem linguists tend to ______ .

单选题(The) Department of Foreign Languages (are not) located (in) the new building (opposite) the old one.

单选题The United States ______ a population of over 200 millions. A. have had B. is having C. have D. has

单选题Not until ______ his shoes did he enter one of the low -ceilinged rooms of the Japanese house. A. did he remove B. he had removed C. had he removed D. he removed

单选题The film ______ him of what he had seen in China.

单选题Although I can walk about, there is still a ______ pain in my leg.

单选题Tom has already given up the ______ of smoking for the sake of health.

单选题______ we can get rid of pollution is still a big problem.

单选题Modern medicine and new methods of food production allow adults to live longer and babies to ______ , not die soon after birth.A. surviveB. grow upC. existD. develop

单选题The ______ flowers were all that remained.

单选题Martin, when you go to the meeting tomorrow, ______ your iPad with you.

单选题The people at the party were worried about Janet because no one was aware ______ she had gone. A. where that B. of where C. of the place D. the place

单选题Return the book immediately to the library as soon as you ______ with it.