题目

You ________ that late last night .You have three days to finish the work. A . didn't need to work B . needn't have worked C . need to work D . need working 答案：B营养学家建议青少年学生要多喝牛奶和多吃瘦肉，主要原因是（　　）A．牛奶和瘦肉中含有较多的脂肪，这是青少年正常生长所必需的B．牛奶和瘦肉中含有较多的无机盐，这是青少年正常生长离不开无机盐C．牛奶和瘦肉中含有较多的蛋白质，青少年生长发育旺盛，需要较多的蛋白质D．牛奶和瘦肉中含有较多的维生素，这是青少年正常生命活动不可缺少的