53. By mentioning the four pieces of advice from a new study, the author wants to show 　　　　　　.

　　 A. he has benefited from it

　　 B. he shares the same opinion with Ashley Crossman

　　 C. the importance to obey the rules　

　　 D. the origin of the advice

52. The passage is mainly about 　　　　　　.

　　 A. American living habits　　

　　 B. best prevention for obesity

　　 C. children’s self-esteem　　

　　 D. healthy food for children

51. The example in the passage is to show that　　　　　　　　 .

　　 A. air traffic controllers are often careless

　　 B. air traffic controllers should pay much attention to avoiding accidents

　　 C. it is difficult for airplanes to avoid terrible accidents

　　 D. two planes should not fly too close to each other　　　　　　　　　　　 　

　　　　　　　　　　　　　　　　　 　E

Looking for simple, effective ways to help kids grow up bucking the national obesity(肥胖)trend?

Here’s advice from a new study:

-Make sure kids eat healthfully, starting with a good breakfast every day.

-Limit kids’ sedentary(久坐的) free time.

-Promote positive self-esteem(自尊) in children.

-Be a good role model for a healthy life.

Those tips come from Ashley Crossman, a graduate student at Arizona State University’s sociology department. She looked at data from national surveys of about 6,400 teens and young adults.

Crossman presented her findings in Philadelphia at the American Sociological Association’s annual meeting.

What is Obesity?

Healthy Habits

Participants who grew up to have a healthy weight had some common traits. As teens, they ate breakfast, had good self-esteem, and were too busy to spend tons of time watching TV or playing computer games. Their parents also had some things in common: healthy weight, more education, and control over their kids’ diets. Parents’ income and kids’ race didn’t make a difference, notes Crossman.

Food for Thought

Many factors affect weight, but “our research suggests that prevention must begin at home,” writes Crossman. Healthy eating and active lifestyles are part of the solution she recommends.

Physical activity is promoted as part of a healthy life (get a doctor’s OK first). In this study, “active” didn’t always mean tons of exercise. Teen’s part-time jobs, volunteer activities, and hobbies also helped by reducing time with TV or computer games, notes Crossman.

The American Academy of Pediatrics recom-mends that children at risk should be identified by virtue of family history of obesity, and other factors such as environment. Parents and caregivers should be encouraged to promote healthy eating patterns by offering nutritious snack such as fruit and vegetables, low-fat diary products, and whole grains; setting appropriate limits and modeling healthy food choices. They also recommend limiting television and viewing time to a maximum of two hours a day.

50. The danger of air crashes grows every year because 　　　　　　.

　　 A. airliners are getting larger and air traffic is becoming heavier

　　 B. a pilot does not always hear a controller’s order

　　 C. a controller is likely to make more and more mistakes

　　 D. airports can hardly serve the growing number of airplanes

49. The air traffic controllers of an airport　 　　　　　　.

　　 A. control all the planes flying near the airport

　　 B. give orders to planes leaving the airport

　　 C. only deal with the planes that want to land there

　　 D. are ordered to handle 2500 planes a day in England

48. Which of the following is TRUE according to the passage?

　　 A. Traveling by air is as safe as by car.

　　 B. Traveling by air is not as safe as by car.

　　 C. Traveling by car is as dangerous as by air.

　　 D. Traveling by car is more dangerous than by air.

47. What is the main idea of this passage?

　　 A. Children in single-parent families often have mental problems.

　　 B. Mother’s love plays an important role in teenagers’ life.

　　 C. Being understood by parents is very important to teenagers.

　　 D. School education doesn’t work without full support from parents.　 　　　　　　　

　　　　　　　　　　　　　　　　　 D

Today, air travel is far safer than driving a car on a busy motorway. But still there is a danger that grows every year. Airliners get larger and larger. Some airplanes can carry over 300 passengers. And the air itself becomes more and more crowded. If one large airliner struck into another in mid-air, 600 lives could be lost.

From the moment an airliner takes off to the moment it lands, every movement is watched on radar screens. Air traffic controllers tell the pilot exactly when to turn, when to climb, and when to come down. The air traffic controllers around a busy airport like London-Heathrow may deal with 2,500 planes a day. Not all of them actually land at the airport.　 Any plane that flies near the airport comes under the orders of the controllers there. Even a small mistake on their part could cause a terrible accident.

　　 Recently such a disaster almost happened. Two large jets were flying towards the airport. One was carrying 69 passengers from Toronto, the other 176 passengers from Chicago. An air traffic controller noticed on his radar screen that the two planes were too close to each other. He ordered one to turn to the right and to climb. But he made a mistake. He ordered the wrong plane to do this. So, instead of turning away from the second plane, the first plane turned towards it. Fifteen seconds later it flew directly in front of the second plane. They avoided each other by the smallest part of a second. The distance between them was less than that of a large swimming pool. This is an example of the danger that grows every year.

46. The sentence “... he even made the honor roll” means that 　　　　　　.

　　 A. he was even on the list to be praised at the parent-teacher meeting

　　 B. he was even on the list of students who made progress in grades

　　 C. he was even on the list of students who had turned themselves around

　　 D. he was even on the list of the best students at school

45. There was silence on the other end of the line because 　　　　　　.

　　 A. the speaker was too moved to say anything to the mother

　　 B. the speaker waited for the mother to finish speaking

　　 C. the speaker didn’t want the mother to recognize his voice

　　 D. the speaker was unable to interrupt the mother

44. By saying “Karl became withdrawn”, the author means that the boy changed entirely and

　　　　　　　 .

　　 A. preferred to stay alone at home　　　　

　　 B. lost interest in his studies

　　 C. refused to talk to others　　　　　　

　　 D. began to dislike his mother