男孩在长肌肉协调动作方面比女孩强些,如抛球、跳上跳下、上下楼梯等;而在短肌肉协调方面,如单足跳、跳跃步和手的精细动作方面,女孩则比男孩强。这说明学前儿童动作的发展受到什么因素影响?
A.遗传
B.成熟
C.教育和练习
D.个体的动机
正确答案是A
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Energy sources may initially be divided into two kinds: non-renewable and renewable. The former group includes coal, oil, gas and, in the long run, nuclear; the latter waterpower, solar power and wind power. The energy from all these sources ultim