Let's do some sleep math. You lost two hours of sleep every night last week because of a big project due on Friday. On Saturday and Sunday, you slept in, getting four extra hours. On Monday morning, you were feeling so bright-eyed, and you only had one cup of coffee, instead of your usual two. But don't be cheated by your energy: You're still carrying around a heavy load of sleepiness, or what experts call " sleep debt "win this case something like six hours, almost a full night's sleep.
Sleep debt is the difference between the amount of sleep you should be getting and the amount you actually get. It's a deficit (赤字)that grows every time we skim some extra minutes off our nightly sleep. "People accumulate sleep debt gradually without being noticed," says psychiatrist William C. Dement, founder of the Stanford University Sleep Research Centre. Studies show that such short-term lack of sleep
leads to a foggy brain, worsened vision, and trouble remembering. Long-term effects include obesity, insulin(胰岛素) resistance, and heart disease. A survey by the National Sleep Foundation reports that we're losing one hour of sleep each night —more than two full weeks of sleep each year.
The good news is that, like all debt, with some work, sleep debt can be repaid. Adding an extra hour or two of sleep a night is the way to catch up. For the long-term lack of sleep, take it easy for a few months to get back into a natural sleep pattern. Go to bed when you are tired, and allow your body to wake you in the morning (no alarm clock allowed). You may find yourself catatonic (有紧张感的)in the beginning of the recovery cycle: Expect to have ten hours' shut-eye per night. As the days pass, however, the amount of sleeping time will gradually decrease.
So earn back that lost sleep —and follow the orders of your inner sleep needs, and you'll feel better. "When you put away sleep debt, you become superman." Says Stanford's Dement, talking about the improved mental and physical capabilities that come with being well rested.
72. The example of sleep math is used to show       .                                                                                          
A. in what case you build up a sleep debt
B. why you need six hours' sleep every night.
C. why you are full of energy even when lacking sleep.
D. you should drink coffee to keep energetic  
73. The author begins Paragraph 2 with       .
A. an example     B. a definition     C. an order     D. a story
74. By saying the underlined sentence in the last paragraph, Dement means       .
A. a superman always needs a lot of sleep
B. you can become superhuman after you repay your debt
C. you will be in a good state with enough sleep
D. you will become superhuman if you don't make up for sleep debt
75. What might be the most suitable title for the passage?
A. How can you keep energetic?     B. Can you have a good sleep?
C. What is sleep debt?             D. Can you catch up on sleep debt?

The tasty cream-filled golden sponge(海绵) cakes have been an American favorite for decades. These are just a few of the sugary treats made by the beloved Hostess brand. But after more than 80 years, Americans have to say goodbye to these iconic (标志性的) desserts. Early last week, Hostess announced it is going out of business.

   "Many people have worked unbelievably long and hard to keep this from happening," said Hostess CEO Gregory F. Rayburn. "Hostess Brand has no other alternative than to begin the process of getting down and preparing for the sale of our iconic brands." Along with Twinkles (奶油蛋糕) and Wonder Bread, cupcakes and other sugary treats may disappear from the shelves.

   In the past decade, Hostess has experienced difficulties with its management and high labor costs. The company had money troubles in the past, but this time there was no way to recover. Along with the loss of sugary treats comes the loss of nearly 20,000 jobs. Hostess fans hope that another company will buy out the Hostess.

  The downfall of Hostess is due not just to the company's financial problems, but also to a changing America. Our country's tastes and lifestyles are not the same as they were eighty years ago. Americans have become more health-conscious, and they are demanding more healthful food products. As a manufacturer of high-calorie products, Hostess does not fit into this new way of life.

   To make matters worse for Hostess, Americans do not eat as much bread as they once did. "More and more people are choosing one-dish meals," said Harry Balzar. "The tradition of bread as a side dish is going out." Americans are finding alternatives to their morning toast too. Instead they’re choosing quick snacks like yogurt and energy bars.

  Will Twinkles become an image of a bygone(过去的) America? Hostess fans hope that it will secure its spot on supermarket shelves for years to come. We can only wait. And maybe eat fruit for dessert instead.

1. What caused Hostess to be in trouble in the last 10 years? (no more than 7 words)

_____________________________________________________________________

2. Can you list three disappearing sugary desserts by Hostess? (no more than 5 words)

_____________________________________________________________________

3.What makes Hostess's situation more severe? (no more than 9 words)

_____________________________________________________________________

4. What's the hope of Hostess fans about this spongy snack's future? (no more than 20 words)

_____________________________________________________________________

King’s College Summer School
King’s College Summer School is an annual(每年的) training program for high school students at all levels who want to improve their English. Courses are given by the teachers of King’s College and other colleges in New York. Trips to museums and culture centers are also organized. This year’s summer school will be from July 25 to August 15.
More information is as follows:

Organic food has no nutritional or health benefits over ordinary food，according to a major study．
Researchers from the London School of Hygiene & Tropical Medicine said consumers were paying higher prices for organic food because of its imagined health benefits，creating a global organic market worth an estimated $48 billion in 2007．
A systematic review of 162 scientific papers published in the scientific literature over the last 50 years，however，found there was no significant difference．
“A small number of differences in nutrient content were found to exist between organically and conventionally(通常)produced foodstuffs，but these have nothing to do with public health，” said Alan Dangour ，one of the report's authors．
“Our review indicates that there is currently no evidence to support the selection of organically over conventionally produced foods on the basis of nutritional superiority ．”
The results of research，which was commissioned by the British government’s Food Standards Agency，were published in the American Journal of Clinical Nutrition．
Sales of organic food have fallen in some markets，including Britain，as a slowdown in economic growth has led consumers to cut back on purchases．
The Soil Association said that growth in sales of organic products in Britain slowed to just 1.7percent，well below the average annual growth rate of 26 percent over the last decade．
64. Why does organic food cost more than conventionally produced food?
A. Because people think they are much healthier.
B. Because they are more delicious.
C. Because people prefer organic food.
D. Because they sell better.
65. According to the study，organic food is       than conventionally produced food.
A. much healthier            B. better    
C. no healthier              D. less healthier
66. Sales of organic food have fallen because of      .        .
A. high price            B. economic decline    
C. bad service           D. poor quality
67. Where can you find this passage in a k*s#5^unewspaper?
A. Economy            B. Science．    
C. Food & Nutrition      D. Fashion

Why Is Exercise Cool?
Exercise strengthens Muscles
Did you ever do a push-up or swing across the monkey bars at the playground? 【小题1】  By using your muscles to do powerful things, you can make them stronger. For older teens and adults, this kind of workout can make muscles bigger, too.
【小题2】  
Can you touch your toes easily without yelling ouch? Most kids are pretty flexible, which means that they can bend and stretch their bodies without much trouble. Being flexible is having “full range of motion” , which means you can move your arms and legs freely without feeling tightness or pain.
Exercise Keeps the Balance
【小题3】  Your body needs a certain amount of calories every day just to function, breathe, walk around, and do all the basic stuff. 【小题4】  If you’re not very active, your body won’t need as many calories. Whatever your calorie need is, if you eat enough to meet that need, your body weight will stay about the same. If you eat more calories than your body needs, it may be stored as extra fat.
Exercise Makes You Feel Good
It feels good to have a strong, flexible body that can do all the activities you enjoy---like running, jumping, and playing with your friends. It’s also fun to be good at something, like scoring a basket, hitting a home run, or perfecting a dive.
But you may not know that exercising can actually put you in a better mood. 【小题5】  It’s just another reason why exercise is cool!