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第三篇
Americans still have been gaining weight,although they have cut their average fat intake from 36 to 34 percent of their total diets in the past 15 years.Indeed,cutting fat to control or lose weight makes sense. Fat has nine calories per gram. Protein and carbohydrates（碳水化合物）which break down into amino acids and simple sugars respectively,have just four. Moreover,the body uses fewer calories to metabolize（新陈代谢）fat than it does to metabolize other foods.
But cutting fat from your diet doesn't necessarily mean your body won't store fat. For example, between nonfat and regular cookies,there's trivial difference in calories because manufacturers make up for the loss of fat by adding sugar. Low-fat crackers,soups and dressings can also be just as high in calories as richer versions.No matter where the calories come from,overeating will still cause weight gain.The calories from fat just do it a little quicker. A Wisconsin computer programmer who decided with a diet coach to eat only 40 grams of fat a day learned the lesson firsthand.He wasn't losing weight.Then he showed his food diary to his coach and revealed he'd been eating half a pound of jelly beans a day."They don't have any fat,"he explains.But they had enough sugar to keep him from losing an ounce.
Nonfat foods become add-on foods.When we add them to our diet,we actually increase the number of calories we eat per day and gain weight. That was born out in a Pennsylvania State University study.For breakfast,Prof. Barbara Rolls gave two groups of women yogurt that contained exactly the same amount of calories.One group's yogurt label said"high fat”一the other,"low fat". The"low fat"yogurt group ate significantly more calories later in the day than the other group. "People think they've saved fat and can indulge themselves later in the day with no adverse consequences,"says Richard Mattes,a nutrition researcher at Purdue University."But when they do that,they don't compensate very precisely,and they often end up overdoing it."
Which of the following contains fewer calories?
A:Fat.
B:Sugar.
C:Protein and carbohydrates.
D:Amino acids.
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第三篇
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第三篇
It is natural for young people to be critical of their parents at times and to blame them for most of the misunderstandings between them.They have always complained,more or less justly,that their parents are out of touch with modern ways;that they are possessive and dominant;that they do not trust their children to deal with crisis;that they talk too much about certain problems;and that they have no sense of humor,at least in parent-hild relationships.
I think it is true that parents often underestimate their teenage children and also forget how they themselves felt when young.
Young people often irritate their parents with their choices in clothes and hairstyles,in entertainments and music.This is not their motive.They feel cut off from the adult world into which they have not yet been accepted.So they create a culture and society of their own.Then,if it turns out that their music or entertainments or vocabulary or clothes or hairstyles irritate their parents,this gives them additional enjoyment. They feel they are superior,at least in a small way,and that they are leaders in style and taste.
Sometimes you are resistant and proud because you do not want your parents to approve of what you do.If they did approve,it looks as if you are betraying your own age group.But in that case, you are assuming that you are the underdog:you can't win but at least you can keep your honor. This is a passive way of looking at things.It is natural enough after long years of childhood,when you were completely under your parents' control. But it ig而res the fact that you are now beginning to be responsible for yourself.
If you plan to control your life,cooperation can be part of that plan.You can charm others,especially your parents,into doing things the way you want.You can impress others with your sense of responsibility and initiative,so that they will give you the authority to do what you want to do.
The author is mainly talking to_________.
A:parents of teenagers
B:those who give advice to teenagers
C:newspaper readers
D:teenagers
共用题干
Natural Medicines
Since earliest days,humans have used some kinds of medicines.We know this because humans have survived.Ancient treatments for injury and disease were successful enough to keep humans from dying out completely.
They were successful long before the time of modern medicine. Before the time of doctors with white coats and shiny（发亮的）instruments. Before the time of big hospitals with strange and wonderful equipment.
Many parts of the world still do not have university-educated doctors. Nor do they have expensive hospitals.Yet injuries are treated.And diseases are often cured.How?By ancient methods. By medicines that might seem mysterious , even magical（有魔力的）.Traditional medicines are neither mysterious nor magical,however.
Through the centuries , tribal（部落的）medicine men experimented with plants. They found
many useful chemicals in the plants.And scientists believe many of these traditional medicines
may provide the cure for some of today's most serious diseases.
Experts say almost 80% of the people in the world use plants for health care.These natural medicines are used not just because people have no other form of treatment. They are used because people trust them. In developed areas,few people think about the source of the medicines they buy in a store .Yet many widely-used medicines are from ancient sources,especially plants.
Some experts say more than 25%of modem medicines come,in one way or another,from nature.
Scientists have long known that nature is really a chemical factory. All living things contain chemicals that help them survive .So scientists' interest in traditional medicine is not new.But it has become an urgent concern.This is because the earth's supply of natural medicines may be dropping rapidly.
The passage indicates that ancient treatments for injury and disease were
A: much more successful than modem ones
B: successful enough for humans to survive
C: successful in all cases
D: of little help to humans
Natural Medicines
Since earliest days,humans have used some kinds of medicines.We know this because humans have survived.Ancient treatments for injury and disease were successful enough to keep humans from dying out completely.
They were successful long before the time of modern medicine. Before the time of doctors with white coats and shiny（发亮的）instruments. Before the time of big hospitals with strange and wonderful equipment.
Many parts of the world still do not have university-educated doctors. Nor do they have expensive hospitals.Yet injuries are treated.And diseases are often cured.How?By ancient methods. By medicines that might seem mysterious , even magical（有魔力的）.Traditional medicines are neither mysterious nor magical,however.
Through the centuries , tribal（部落的）medicine men experimented with plants. They found
many useful chemicals in the plants.And scientists believe many of these traditional medicines
may provide the cure for some of today's most serious diseases.
Experts say almost 80% of the people in the world use plants for health care.These natural medicines are used not just because people have no other form of treatment. They are used because people trust them. In developed areas,few people think about the source of the medicines they buy in a store .Yet many widely-used medicines are from ancient sources,especially plants.
Some experts say more than 25%of modem medicines come,in one way or another,from nature.
Scientists have long known that nature is really a chemical factory. All living things contain chemicals that help them survive .So scientists' interest in traditional medicine is not new.But it has become an urgent concern.This is because the earth's supply of natural medicines may be dropping rapidly.
The passage indicates that ancient treatments for injury and disease were
A: much more successful than modem ones
B: successful enough for humans to survive
C: successful in all cases
D: of little help to humans
