C. explain that people have less chances to enjoy nature.

　　D. show that we can also enjoy nature at home through them.

　　50. The author wrote the passage to __________.

　　A. express the feeling of returning to nature.

　　B. show the love for the moonlight.

　　C. advise modern people to learn to live.

　　D. want to communicate longing for modern life.

　　D

　　Sport is not only physically challenging, but it can also be mentally challenging. Criticism from coaches, parents, and other teammates, as well as pressure to win can create an excessive amount of anxiety or stress for young athletes(运动员). Stress can be physical, emotional, or psychological and research has indicated that it can lead to burnout. Burnout has been described as dropping or quitting of an activity that was at one time enjoyable.

　　The early years of development are critical years for learning about oneself. The sport setting is one where valuable experiences can take place. Young athletes can, for example, learn how to cooperate with others, make friends, and gain other social skills that will be used throughout their lives. Coaches and parents should be aware, at all times, that their feedback to youngsters can greatly affect their children. Youngsters may take their parents' and coaches' criticisms to heart and find a flaw (缺陷) in themselves.

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