题目

 -_______ does she go to fly kites?      -_______ a month.    A. How long; One time                    B. How soon; Once    C. How often; Once time                 D. How often; Once 答案：D如图曲线表示某种物质在消化道内的消化情况，这种物质是（　　）A. 淀粉B. 蛋白质C. 脂肪D. 水