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?

Any diet on which you eat fewer calories than you need to get through the day — like an 800-calorie-per-day diet can be dangerous. Diets that don't allow any fat also can be bad for you. Everyone needs a certain amount of fat in their diet — up to 30% of total calories — so no one should eat a completely fat-free diet.

Don't have diets that restrict （限制）certain food groups, either. A diet that requires you to say no to bread or pasta or allows you to eat only fruit is unhealthy. You won't get the vitamins and minerals you need. And although you may lose weight, you'll probably gain it back as soon as you start eating normally again.

Some people start dieting because they think all the problems in their lives are because of weight. Others have an area of their lives that they can't control, like an alcoholic parent, so they focus on something they can control — their exercise and food intake.

People who diet may get lots of praise from friends and family when they start losing pounds, which makes them feel good. But eventually a person reaches a weight level — and doesn't lose as much weight as before because the body is trying to keep a healthy weight, so they aren't any happier.

Some people may find it hard to control their eating, so they stick with an extreme diet for a little while, but then eat tons of food. Feeling guilty about the binge, they use laxatives（泻药）. Eating too little to maintain a healthy weight or eating only to throw up the calories are both eating disorders, which are harmful to a person's health.

1. Which is not the result of restricting certain food groups?

  A. lose weight for a short period          B. unhealthy  

  C. short of nutrition                     D. hungry

2. The reasons why some people start and keep dieting DON’T include__________.

  A. They think their trouble comes from their weight.

  B. They have an alcoholic parent.

  C. Other people’s praise when they lose some weight.

  D. There is something they can’t control except food intake.

3. The underlined phrase in the last paragraph refers to _________.

  A. a fat-free diet               B. a special diet   

  C. eating too much             D. eating too little

4. Which of the following statements is true?

  A. A person needs about 800 calories each day.

  B. A person who doesn’t eat bread is unhealthy.

  C. An improper diet may cause eating disorder.

  D. Fat takes up the most part of calories inside body.

5. According to the passage, when people want to lose weight, they should_________.

  A. avoid eating some food that can lead to being fat   B. control their eating amount and times

  C. have a healthy and balanced diet                D. throw up some of what they eat  

Steve Fossett did not really look like an adventurer, but he reached some of the most difficult goals in sailing and flying.
Fossett was most proud of being the first person to fly around the world alone in a hot-air balloon. To make a trip around the world alone, it was necessary to have an improved autopilot (自动驾驶仪) device. Fossett had one of his team members develop a more advanced balloon autopilot that would allow him to sleep and do other tasks while flying safely.
Steve Fossett attempted the hot-air balloon trip around the world six times. This was not easy to do. He flew in the balloon’s capsule (密封舱) that was too small to stand upright. During his fourth attempt in 1998, he was almost killed during a storm off the coast of Australia. He fell 9,000 meters into the Coral Sea with his balloon’s capsule on fire. He was later rescued at sea.
Fossett successfully made the trip in 2002. The trip started and ended in Australia. He traveled more than 33,000 kilometers for more than 14 days. On this flight, Fossett set other records including a speed record of 322 kilometers per hour. One main problem with earlier balloon flights was the threat of dangerous storms. A team of weather experts e-mailed and talked to Fossett by a satellite telephone to help him avoid such weather.   
Steve Fossett’s hot-air balloon is now at the Smithsonian’s National Air and Space Museum in Washington, D.C.  It is there as an example for other people to try and succeed in doing something important to them.
【小题1】What did Steve Fossett specially prepare for the trip around the world?

China news, Beijing, Feb. 9 – Housing price in China has always aroused heated discussions among property developers（房产开发商）and ordinary Chinese. To many property developers and local government officials, housing price in China is still low compared with many developed countries. However, the average housing price in the United States is only 8,000 yuan per square meter, while in China, it is even higher than in the United States. This shows that there are some bubbles(泡沫) in Chinese real estate market, the International Finance News reported.

Although the average price of residential houses in the United States, after converted（转换）to Renminbi, is about 8,000 yuan per square meter, the houses in US are not sold in terms of building area, as most Chinese property developers do when they sell their houses. If US property developers sell their houses according to the building area, then the housing price will be even lower than 8,000 yuan per square meter. In most big Chinese cities, such as Beijing, Shanghai, and Shenzhen, houses are sold a t a price even higher than those in the US.

The high housing sales price in large cities in China proves that Chinese real estate（房地产）market does have some bubbles. Moreover, Chinese houses can not be compared with houses in US in terms of building quality, environment and supporting facilities. Furthermore, it should be noted that American people’s average income is several dozen times higher than that of Chinese people. How can the Chinese afford to buy a house which is even more expensive than that sold in US?

At the beginning of 2007, Chinese government issued a set of policies that aimed to benefit the public. Now in order to reduce the high housing prices, the government can regulate (控制) the real estate market by raising tax on property industry and controlling the release of loans（贷款）and lands to property developers. At the same time, the government should allow people to build more houses through various fund-raising channels, such as funds collected from buyers or raised by working units. By applying these multiple means, it is expected that the high housing prices can be lowered.

1.What is the average housing price per square meter in China?

         A．8000 yuan.              B．10000 yuan.            C．7000 yuan.              D．it’s not mentioned here.

2.Which of the following does NOT support the idea that the average housing price in China is  even higher than in the United States?

        A．Chinese houses can not be compared with houses in US in terms of building quality, environment and supporting facilities.

        B．American people’s average income is several dozen times higher than that of Chinese       

people.

        C．The houses in US are not sold in terms of building area, as most Chinese property       

developers do when they sell their houses.

        D．There population who need houses in China than in the United States.

3.How many measures are mentioned in the last paragraph in order to reduce the high housing  prices?  

         A．Four.                        B．Three.                     C．Tow.                         D．One.

4.What is the main idea of this passage?

      A．The housing price in China is so high that the government should do something useful to

prevent it.

        B．There are some bubbles in Chinese real estate market.

        C．The average housing price in China is even higher than in the United States.

        D．The Chinese government issued a set of policies that aimed to benefit the public.

阅读下列应用文及相关信息，并按照要求匹配信息。
首先请阅读下列英语读物的封面及基本信息:
A．National Geographic Complete Birds of the World

LIMITED-TIME OFFER: Order today and save $5.00!
Was: $35.00
Now: $30.00
Hardcover
384 pages; 900 color photographs and illustrations
B．Visions of Paradise
 
National Geographic photographers reveal unique wonders of nature.
$35.00
Hardcover
304 pages; 250 photographs
C．National Geographic Adventure Magazine

Join the adventure with National Geographic Adventure Magazine. Please allow 4-6 weeks for the delivery of the first issue within the U.S. and Canada. For outside of the U.S. and Canada, please allow 8-12 weeks for the delivery of the first issue.
$12.00
D．Cesar's Way:

The Natural, Everyday Guide to Understanding and Correcting Common Dog Problems
America's most sought-after expert reveals what dogs truly need to live a happy and fulfilled life.
Was: $24.95
Now: $14.95
Hardcover
243pages
E. National Geographic Ultimate Field Guide Photography, 2nd Edition

Softcover
400 pages; 272 color and black-and-white photographs
Thoroughly updated for 2009, straightforward and entertaining, this is the ultimate source for people seeking real how-to advice from the editors and photographers of National Geographic. It is carefully designed to lead the amateur photographer to better pictures and is comprehensive in scope, explaining the entire process from choosing a camera to taking the pictures to printing, scanning, and archiving the images.
F. New York: Destination Music CD

Innovative artists continue New York's cabaret tradition.
$19.95
It's Showtime!
下面是读者的简要内容。请把相关的内容与它们的书名匹配起来。
【小题1】. Hinny is filled with hope and inspiration to celebrate and protect the world's environments. Looking through the book, he knows that every beautiful sight that meets his eyes is a precious dreamland worth preserving a special place that feels like “Heaven on Earth”.
【小题2】 Jumpy is pleased that his newly-bought book is a fascinating colorful guide to all the birds on the planet, their identification, structures and plumages, habitats, behaviors, and ranges.
【小题3】 Pope is using a film camera for his part-time photographs by means of his guide photography. Now he is armed with the practical know how-to get great images.
【小题4】Jackson will get a wealth of ideas for making adventure a part of his life with the magazine! He likes every issue of this magazine packed with breathtaking photography and compelling features on topics such as diving, snorkeling, skydiving, hang gliding, kayaking, rafting, sailing, climbing, hiking, and more.
【小题5】Dingy is invited to join an excursion into the rich rhythms and textures of music from the far reaches of the world. He enjoys the diverse mix of memorable music from these special corners of the Earth as he browses through some of the fascinating cultural facts and maps of each region and then sets off for his destination!