For most of us, dieting is an annoying fact life. With so much information available, it can be difficult to tell which weight-loss strategies really work. Let’s start by taking a look at some confusing myths (荒谬)。

1.All calories are created equal.

What you eat, not how much, is the main factor behind weight gain. In fact, the body burns many more calories digesting carbohydrates than it does digesting fat ,For every 100 calories of carbohydrates we consume in excess (超过)of our daily requirement ,only 75 are turned into body fat .But 97 of every 100 excess fat calories are turned into body fat .

2.Desserts and fast foods are forbidden.

Some experts advise against describing foods as “ good ”and “bad ”.Even cakes ,pies ,and ice cream can be worked into a diet, Moderation is the key. Besides ,a plain hamburger on a bun is still a healthful choice ,So is baked chicken or a green salad with low –cal,dressing. But watch out for French fries, and fried chicken of fish .

3.It makes no difference whether you’re top or bottom –heavy.

In fact ,where weight is distributed makes all the difference. Recent studies suggest that people who store fat on the upper body (apple shape )rather than on hips and thighs (大腿)脚（pear shape ）may have an increased rick of heart disease.There is probably little you can do to change how your body is genetically programmed to store fat ,But you can lost excess weight overall .

4.Fasting is the fastest diet .

Some studies suggest that suddenly reducing calorie intake puts the body into “starvation mode ”,which causes it to conserve calories and decreases the rate of digestion .The more often you deprive yourself of food ,the better your body may get at storing calories ,So ,in the long run ,repeated fasting may actually weaken your weight –loss efforts.

5.To keep weight off ,simply watch what you eat

According to studies ,exercise combined with dieting ensures weight loss better than dieting alone does. Experts also agree that having regular, moderate exercise is more important than occasional exercises. Researchers encourage patients to take the stairs instead of the elevator and park the car far from where you are going and walking.

6.It’s all your fault that you’re fat

Research at the University of Pennsylvania, School of Medicine indicates that body shape and size are in large part decided by a person’s genes. In short ,some people are naturally more likely to be fat than other.Moreover, someone who was fat in childhood will have more fat cells than a person of average weight. Once made, the cells may enlarge or shrink (缩小),but they never disappear.

Yet genes don’t have to control your shape ,The size of your fat cells depends on you ---- on your eating habits and lifestyle ,Most important ,before getting caught up in dietary myths ,let good sense shape your eating habits ,Your body will thank you for it .

1.Whci of the following statements is true?

A. All calories are created equal .

B. You can decide whether fat will be stored on your upper body or lower body.

C. While you are on a diet never eat desserts and fast food

D. The size of fat cells is decided by our eating habits and lifestyle

2.Which of the following statements is true about fat cells and genes?

A. Everyone has the same amount of fat cells .

B. The size of fat cells is fixed ,They won’t become bigger or smaller

C. Genes have nothing to do with obesity.

D. Where you store your fat is genetically decided

3.The main reason why the author writes this article is to ___________

A. give new ideas                 B. correct certain misunderstandings

C. encourage the readers to keep fit D. explain the concept of calories ,fat cells ,and genes

4.This article is ____________

A. descriptive       B. creative         C. persuasive       D. educative

The 9.2一magnitude(震级)earthquake which caused the tsunami in
the Indian Ocean on Boxing Day last year occurred at 7:58 a.m.，95 miles off the west coast of Aceh, Indonesia.
Eighteen minutes later.10-metre high waves crashed the ashore along a 500——mile-long stretch of Aceh.
Two hours later the tsunami hit Thailand and Malaysia and then Burma, Bangladesh, India，the Maldives，Sri Lanka，Kenya and Somalia.The final death toll is thought to be about 280，000，with tens of thousands more listed as missing.More than l.8 million people lost their homes.
●What Is Tsunami?
A tsunami is a chain of fast moving waves caused by a sudden strong quake in the ocean.They can be caused by earthquakes，volcanic eruptions(爆发)，or even the collision of meteorites(陨星).Tsunamis are also incorrectly known as tidal waves，but unlike tidal waves they are not caused by changes in the tides.
They are also most common around the edge of the Pacific，where more than half of the world’s volcanoes are found.These fast moving waves can attack coastlines，often with little or no warning.Rocks weighing as much as 20 metric tonnes have been pulled from sea walls and carried l 80m inland.
●Wave Power
Atsunami can have a wavelength in excess of(超过)1 00km and there may be an hour between them.They travel at great speeds across an ocean with hardly any energy losses and are barely noticeable out at sea.
Over the deep Pacific Ocean，a tsunami travels at about 800kph.If an earthquake happened in Los Angeles.a tsunami could hit Tokyo quicker than you could fly between the cities by jet.
●Strange Animal Behaviors
Ten days before giant waves slammed into Sri Lanka and India coastlines，wild and domestic(家养的) animals seemed to know what was about to happen and fled(逃跑)to safety.
Elephants screamed and ran for higher ground.
Dogs refused to go outdoors.
Zoo animals rushed into their shelters and could not be enticed(引诱)to come back out.

1. 1.

   ..What does the first part of the passage mainly tell us?

   1. A.
      The great speed of a tsunami.
   2. B.
      The number of deaths caused by a tsunami.
   3. C.
      The countries which were struck by a tsunami.
   4. D.
      The serious destruction caused by the great power of a tsunaml.
2. 2.

   ..All the following can cause a tsunami except

   1. A.
      changes of the tides
   2. B.
      volcanic eruptions
   3. C.
      collision of meteorites
   4. D.
      earthquakes
3. 3.

   ..Which of the following is a characteristic of a tsunami?

   1. A.
      Having a lot of small waves linked together.
   2. B.
      The waves of a tsunami travel extremely fast.
   3. C.
      The waves of a tsunami can be found in the distance.
   4. D.
      The power of the waves becomes stronger and stronger as a tsunami travels.