1. What is the best title of the passage?(no more than 15 words)

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2. Can you use another English word to explain the underlined word “cultivating”?(no more than 3 words)

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3.According to the passage, what are the four kinds of sports causing athletic concussions?

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4.Why is the number, gathered by researchers at Nationwide Children's Hospital in Columbus, Ohio, not accurate(精确的)?(no more than 20 words)

5.Do you like playing basketball? How can you protect yourself in the game?(no more than 30 words)

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6. How many children play basketball each academic year?(no more than 1 word)

The best swimmers tend to be tall and thin with long arms, long legs, long feet, and long hands. The size of their hands gives them great “water grasp”, and only a very small hand movement keeps them afloat.

They also have great strength, endurance, insulation(隔绝) against heat loss while in water below body temperature, thus better energy conservation, low resistance(阻力) when in the water, and swimming stroke mechanics(动作技巧).

Part of the reason why some people are better swimmers than others has to do with body density. The average person’s body density is slightly less than that of water. Muscle has greater density than fat. Therefore, very muscular people tend to be poor at staying afloat. Bone has greater density than fat. Therefore, very skinny people tend to be poor at staying afloat.

Good buoyancy(浮力) is not necessarily the most important factor in good swimming, but it certainly helps. For example, great competitive swimmers—tall, thin, and usually more muscular than average—tend to have greater body density than average and less buoyancy. Many would not float very well if they remained motionless in the water. Their much greater “water grasp” makes up for it. 

The average woman contains a higher proportion(比例) of fat in her body than the average man, and the average man contains a higher proportion of muscle in his body than the average woman. Therefore, in general, women are better floaters than men. Compared with other competitive sports, the performance of women is closer to that of men in competitive swimming.

66. The underlined word “afloat” in the first paragraph might most probably mean “      ”.

     A. keeping quiet       B. swimming faster         C. floating on water    D. never drowning

67. What can we learn from the passage about body density?

     A. Higher body density reduces swimming ability.

     B. A person’s body density decides one’s swimming ability.

     C. Fat people can always swim faster than thin people.

     D. People with a lower proportion of muscle can hardly swim.

68. “Buoyancy” is important because       .

     A. it helps people to be safer in water                   B. it can help people to swim better

     C. it can never be trained to get better                   D. it increases swimming length

69. How is the whole passage organized?

     A. By reasoning and explaining.                           B. By argument and debate.

     C. By explaining one part after another.                 D. By examples and comments.

70. Which of the following can serve as the best title of the passage?

     A. How to be a good swimmer                            B. Details about swimming

C. Facts about swimming                              D. Better ways, better swimmers

One of the most difficult problems a young person faces is deciding what to do. Some people, however, from the time they are six years old “know” that they want to be doctors or teachers or firefighters, but most of us do not get around to making a decision about a job until someone or something forces us to face the problem.
Choosing a job takes time, and there are a lot of things you have to think about as you try to decide what you would like to do. You may find that you will have to take special courses for a particular kind of work, or you may find out that you will need to get enough knowledge for a particular job.
Fortunately, there are a lot of people you can turn to for advice and help in making your decision. At most schools, there are teachers to give you information about jobs. And you can talk over your ideas with family members and friends who are always ready to listen and to offer suggestions.
【小题1】In the third paragraph “turn to” means ______.