A. the lights were directly related to some basic "drives" B. the sight of the lights was interesting C. they need not turn back to watch the lights D. they succeeded in "switching on" the lights 参考答案:D 答案解析:[精解] 符合文章的主题:是成就感而不是有奖赏促使孩子做某些动作。
第13题: [单项选择]成人对葡萄糖的代谢能力为() A. 2~3g/(kg·D. B. 4~5g/(kg·D. C. 6~7g/(kg·D. D. 8~9g/(kg·D. E. E.10g/(kg· 参考答案:B 答案解析:成人对葡萄糖的代谢能力为4~5g/(kg·d),如供给过多过快,将有部分葡萄糖转化为脂肪而沉积于肝脏。