酸碱缓冲溶液一般分为两类：一类是用于控制溶液酸度的一般酸碱缓冲溶液；另一类是标准酸碱缓冲溶液。( )
参考答案：对
用红糖和水的质量比为2：18配制糖水，这种糖水的浓度是______%；如果要配制这种糖水200克，需要红糖______克．
He got up very late, _________ his school bag, and _________ to his school at once.
A．taking; dashing
B．took ; dashing
C．taking ; dashed
D．took ; dashed
