北京邮电大学-2013年5月学位英语真题及答案.doc

1、北京地区成人本科学士学位英语统一考试2013.5.11Part Reading Comprehension (30%)Directions: There are three passages in this part. Each passage is followed some questions or unfinished statements. For each of them there are four choices marked A,B,C and D. You should decide on the best choice and blacken the correspondi

2、ng letter on the Answer sheet。Passage 1Questions 1 to 5 are based on the following passage:Is that 6 a.m. workout getting in the way of good sleep? Dont think your fat cells wont notice. A new study published in The Annals of Internal Medicine (a medical journal) finds that inadequate shut-eye has a

3、 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

4、.The study adds to a growing body of evidence that theres “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.（76）But Ame

5、ricans dont 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

6、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, thin 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

7、.5 hours a night,” says Brady. Then, a month later, they came back for four additional nightsbut this time they were allowed just 4.5 hours of sleep per night. And after each visit, researchers got a sample of their fat.（77）Brady explains that the fat cells responded significantly to the loss of sle

8、ep.“ 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. “Theyre there to store lipids (血脂).” When lipids stay inside the cells, your body can utilize the fat when youre exercising or sleep

9、ing 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.1. According to the passage, lack of sleep for a long while can probably lead to all of the following EXCEPT_.A. heart dise

10、ase B. weight gain C. diabetes D. liver disease2. The main idea of the third paragraph is_A. how to write a medical research paperB. how to avoid sleep lossC. how the research was conductedD. how to conduct a medical experiment3. What does the “leach” in the last paragraph probably mean?A. Leap. B.

11、Lead. C. Lean. D. Leak.4. Which of the following is NOT TRUE according to the passage?A. We will be in trouble if our fat cells become less responsive to insulin.B. More and more studies are done to study the link between sleep and weight.C. More than 20% of Americans are not getting enough sleep.D.

12、 Fat cells are there to help us maintain a good health.5. Which of the following is an appropriate title for this passage?A. Poor Sleep May Lead to Too Much Stored Fat and DiseaseB. Sleep Experts Had Exciting Findings in a Fat StudyC. Americans Should Have More Than Six Hours of SleepD. Bad Things H

13、appen if Fat Cells Become Our FriendPassage 2Questions 6 to 10 are based on the following passage:The top of the world is a wonderland. In winter, the temperature often falls to -30F and the sun never rises. The ocean is surrounded by frozen ground. There are few people or trees, but to polar bears,

14、 the Arctic(北极)is home.（78）Polar bears have thick fur, big paws and other features that make them well prepared for life in their tough environment. In fact, they need the Arctic sea ice for survival. But climate change is causing larger areas of summer sea ice to melt(融化). Experts say that if warmi

15、ng patterns continue, the Arctic could be free of summer sea ice by 2050. That may cause two-thirds of the worlds 20,000 polar bears to be gone by then too.Polar bears cant survive for long on land. Seals are their main source of food. The only place where polar bears can hunt seals is on the ice.（7

16、9）Although these bears are strong swimmers, they are no match for lightning swift seals in the water. A polar bear has brilliantly clever strategies to overcome this disadvantage. In winter the bear waits motionless beside a seals breathing hole, which is a narrow tunnel through the ice. Often many hours pass before the seal comes up for air and the bear kills it with a powerful blow of its