1、 There are three passages in this part. Each passage is followed by 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 corresponding letter on the Answer Sheet. Passage 1 Questions 1 to 5 are bas
2、ed 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 harmful effect on fat calls, reducing their ability to respon
3、d 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 theres“an i
4、ntimate 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 Americans dont seem to be getting the message that we need seven to n
5、ine hours per night. More than 1 in 5 of us,according to a report form 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 coll
6、eagues 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 8.5 hours a night,” says Brady. Then ,a month later,they came back for
7、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 sleep. “I was very surprised to be honest,”he says.Bad things can happen w
8、hen 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 sleeping or going about your day.“However,when fat cells start to become insulin r
9、esistant,the lipids start to leach out of the fat cells and rise in the bloodstream,” Brady says.1. According to the passage,lack of the sleep for a long while can probably lead to all of the following EXCEPT_. 第一段最后一句A. heart disease B. weight gain C. diabetes D. liver disease2. The main idea of th
10、e third paragraph is_. 第一句 A. how to write a medical research paper B. how to avoid sleep loss C. how the research was conducted D. how to conduct a medical experiment3. What does the word “leach” in the last paragraph probably mean? A. Leap B. Lead. C. Lead. D. Leak. 泄露4. Which of the following is
11、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 net getting enough sleep. D. Fat cells are there to help us maintain a good he
12、alth.5. Which of the following is an appropriate title for this passage?A. Poor Sleep May Lead to Too Much Stored Fat and Disease B. Sleep Experts Had Exciting Findings in a Fat Study C. Americans Should Have More Than Six Hours of SleepD. Bad Things Happen if Fat Cells Become Our Friend这篇短文讲睡眠的重要性,
13、不足的睡眠会引起种种不良的后果。76句的翻译是:但是美国人似乎仍不明白:我们每晚需要7至9小时的睡眠。77句的翻译是:布莱德解释说:脂肪细胞对睡眠的减少会产生强烈的反应。1至5题的答案是:ACDDBPassage 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 -30 and the sun never rises. The ocean is surrounded by fr
14、ozen ground. There are few people or trees, but to polar bears, the Arctic (北极) is home. (78) Polar bears have thick fur,big paws and other features that make them wellprepared for life in their tough environment. In fact,they need the Arctic sea ice for survival. But climate change is causing large
15、r and larger areas of summer sea ice to melt (融化). Experts say that if warming patterns continue,the Arctic could be free of summer sea ice by 2050.They 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 sourc
16、e of food. The only place where polar bears can hunt seals is on the ice.(79) 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
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