题干

我国长江和黄河的真正源头到底在哪里?2009年7月,《三江源头科学考察成果》通过专家评审。这一考察成果对长江和黄河源头的地理位置提出了新说,新确定的长江源头为当曲,黄河源头为日卡曲。长江和黄河重新确定了源头。这说明               (   )
①认识具有反复性和无限性
②认识有创新性,其进步要以否定原有理论为前提
③实践是获取正确认识的唯一途径
④任何理论成果都要不断接受现实社会实践的检验

A:①②

B:①④

C:②③④

D:①③④

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B

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    Sport is not only physically challenging, but can also be mentally challenging. Criticism from coaches, parents and other teammates, as well as pressure to win can create too much anxiety or stress for young athletes. 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 faults in themselves.

    Coaches and parents should also pay attention that youth sport participation does not become work for children. The outcome of the game should not be more important than the process of learning the sport and other life lessons. In today's youth sport setting young athletes may be worrying more about who will win instead of enjoying themselves and the sport. Following a game many parents and coaches focus on the outcome and find faults with youngsters' performances. Positive support should be provided regardless of the outcome. Research indicates that positive support motivates and has a greater effect on learning than criticism. Again, criticism can create high levels of stress, which can lead to burnout.