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Many people in the United States worry about not looking young and attractive. For many people, looking good also means being thin. Other people worry about their health. Many doctors say being overweight is not healthy. But are Americans really fat？
Almost 30 million Americans weigh at least 20 percent more than their ideal weight. In fact, the United States is the most overweight country in the world. "The stored fat of adult Americans weighs 2. 3 trillion pounds," says University of Massachusetts anthropologist(人类学家) George Armelagos. He says burning off that stored energy would produce enough power for 900,000 cars to go 12,000 miles.
Losing weight is hard work, but most people want to find a fast and easy way to take off fat. Bookstores sell lots of diet books. These books tell readers how to lose weight. Each year, dozens of new books like these are written. Each one boasts to help people to get rid of fat.
Which of the following is NOT mentioned as a way of losing weight？
A．To eat less fats and sugars.
B．To take much exercise.
C．To have surgery.
D．To work hard.
The growing interest of consumers in the safety and nutritional quality of the typical North American diet is a welcome development. However, much of this interest has been sparked by sweeping claims that the food supply is unsafe or inadequate in meeting nutritional needs. Although most of these claims are not supported by scientific evidence, the greater number of written material advancing such claims make it difficult for the general public to sep arate fact from fiction. As a result, claims that eating a diet consisting entirely of organically grown foods prevents or cures disease or provides other benefits to health have become widely publicized and form. the basis for folklore.
Almost daily the public is surrounded by claims for "no-aging" diets, new vitamins, and other wonder foods. There are numerous unsubstantiated reports that natural vitamins are superior to synthetic ones, that crops grown with organic fertilizers are nutritionally superior to chose with chemical fertilizers, that untreated grains are better than fumigated grains, and the like.
One thing that most organically grown food products seem to have in common is that they cost more than conventionally grown foods. But in many cases consumers are misled if they believe organic foods can maintain health and provide better nutritional quality than conventionally grown foods. So there is real cause for concern ff consumers, particularly those with limited incomes, distrust the regular food supply and buy only expensive organic foods instead.
The author implies that there is cause for concern if consumers with limit ed incomes buy organic foods instead of conventionally grown foods be cause ______ .
A．organic goods can be more expensive but are often no better than conventionally grown foods
B．many organic foods are actually less nutritious than similar conventionally grown foods
C．conventionally grown foods are more readily available than organic foods
D．too many farmers will stop using conventional methods to grow food crops
Fast-food is not part of the diet of all Americans. Another trend of the 1960s, sometimes called the back-to-nature movement influenced many people to avoid food that was packaged or processed(处理). This preference for natural food continued to this day.
From the success of Raymond Kroc’s fast-food business, we can say that social economic trends influence where and what we eat.
1.The main idea of the reading is that ().
A、Raymond Kroc is the most successful fast-food business owner in the world
B、social and economic changes affect eating habits
C、fast-food is easy to prepare and serve quickly
D、Americans eat either fast food or natural food
2.Why was McDonald''s idea so successful？ It was mainly because ().
A、people living alone depend on fast food
B、single parents have little time to spend in the kitchen
C、many women returned to the workplace in 1960s
D、his timing was right
3.Americans had the "movements"().
A、in 1955
B、in 1950s
C、in 1960s
D、both in 1950s and 1960s
4."Cooking for one is more trouble than it is worth" means ().
A、cooking for several people is worth more money
B、it is not necessary to take too much time to cook for one person
C、there are more problems when one person cooks
D、there are a lot of housework and preparation to do when one person cooks
5.An idea implied but not directly stated (陈述) in the reading is that ().
A、many married women began to work in the 1960s
B、natural foods are still popular today
C、fast food is not part of the diet of all Americans
D、divorce causes people to change their eating habits
Then consider this, you might be in a state of subhealth(亚健康).
Subhealth, also called the third state or grey state, is explained as a border line(临界)state between health and disease. According to an investigation by the National Health Organization, over 45 percent of subhealthy people are middle aged or elderly. The percentage is even higher among people who work in management positions as well as students around exam time.
Symptoms(症状)include a lack of energy, depression, slow reactions, insomnia(失眠), agitation(焦虑)and poor memory. Other symptoms include shortness of breath, sweating and aching in the waist and legs.
The key to preventing and recovering from subhealth, according to some medical experts, is to form. good living habits, alternate work with rest, exercise regularly, and take part in open-air activities.
As for meals, people are advised to eat less salt and sugar. They should also eat more fresh vegetables, fruits, fish, because they are rich in nutritional(营养的)elements--vitamins, and trace elements(微量元素)--that are important to the body.
Nutrition experts point out that it is not good to eat too much at one meal because it may cause unhealthy changes in the digestive tract(消化道). They also say that a balanced diet is very helpful in avoiding subhealth.
According to this passage, which of the following is right？
A．When you are in a state of subhealth, you shoud go to see a doctor and buy some medicine.
B．When you are in a state of subhealth, you should stay home and keep silent.
C．When you are in a state of subhealth, you should find out the reasons and relax yourself
D．When you are in a state of subhealth, you shoud have yourself examined in foreign countries.
A.thoughtful
B.considerate
C.fortunate
D.moderate
A.radical
B.moderate
C.nominal
D.legitimate
experimenting on mice. They are studying the relationship between diet and health. At this time, over one hundred experiments are being done in this laboratory.
In one of these experiments, the scientists are studying the relationship between the amount of food the mice eat and their health. The mice are in three groups. All three groups are receiving the same healthy diet. But the amount of food that each group is receiving is different. The first group is eating one cup of food each day, the second group is eating two cups, and the third group of mice is eating three cups.
After three years, the healthiest group is the one that is only eating one cup of food each day. The mice in this group are thinner than normal mice. But they are more active. Most of the day, they are running, playing with one another, and using the equipment in their cages. Also, they are living longer. Mice usually live for two years. Most of the mice in this group are still alive after three years.
The second group of mice is normal weight. They are healthy, too. They are active, but not as active as the thinner mice. But they are only living about two years, not the three years or more of the thinner mice.
The last group of mice is receiving more food than the other two groups. Most of the day, these mice are eating or sleeping. They are not very active. These mice are living longer than the scientists thought - about a year and a half. But they aren't as healthy. They're sick more often than the other two groups.
(1)、The scientists in the laboratory are studying the relationship between the amount of food and diet.
A：T
B：F
(2)、The first two groups are receiving the most food.
A：T
B：F
(3)、The first group is the thinnest because they do not have a healthy diet.
A：T
B：F
(4)、Normal mice usually live for two years.
A：T
B：F
(5)、The text tells us that people who eat less and exercise more will live longer.
A：T
B：F
A.vast amount of laboratory bonding studies on dental oxide ceramics.
B.Air-abrasion at a moderate pressure and using phosphate monomer containing primers and/or luting resins provide long-term durable bonding to glass-infiltrated alumina.
C.A little amount of laboratory bonding studies on dental oxide ceramics.
D.Air-abrasion at a moderate pressure and using phosphate monomer containing primers and/or luting resins do not provide long-term durable bonding to glass-infiltrated alumina.
