题目

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,  (2011江苏南京模拟·8)商业广告是促销的重要手段。据史料记载：中国现代意义上的广告起始于鸦片战争后，民国初年得到显著的发展，1953年后消失，1978年末又重新出现。材料中广告业消失的最主要原因是 A.经济困难，物资匮乏                B.企业热衷产品直销 C.三大改造，政府取缔                D.国家实行计划经济