In swimming there are certain rules every swimmer should follow:

　　1). Never swim alone! No matter how good you are in the water, don’t risk drowning by swimming alone. If you swim by yourself, with no life guards or friends with you, you may get into trouble.

　　2). Don't go beyond your abilities. Most swimmers know enough not to swim too far from the bank or the beach, Showing off by doing dangerous tricks is no good. Swim safely and you will continue to swim and alive.

　　3). Don't smoke. Swimming depends on a healthy body; good lungs are part of it.

　　4). Work at any activity that builds muscles.

　　48. Little children can learn to swim as soon as _____.

　　A. they can talk

　　B.

　　they are five or six years old

　　C. they have no fear of the water

　　D. they start walking

　　49. The author believes that fear of water is_____.

　　A. stupid

　　B. sensible

　　C. dangerous

　　D. not smart

　　50. The stroke that some young swimmers use first is_____.

　　A. butterfly

　　B. backstroke

　　C. breaststroke

　　D. crawl

　　51. According to the passage, you should not swim alone because_____.

　　A. you might drown

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