题目

 According to a study, some serious road accidents usually happen in the last few hours before dawn, when even the most experienced driver has difficulty        awake. A. maintaining   B. preserving   C. claiming     D. staying 答案：D“吃得营养，吃出健康”是人类普遍的饮食追求．下列说法中不正确的是A.儿童适量摄入钙元素可预防佝偻病B.常量元素也不可过量摄入C.多吃水果、蔬菜可以补充维生素D.油脂会使入发胖，故禁食油脂