题目

My father       my brother for driving but he wanted to pick      the knowledge of the computer during his spare time. A. advised; up                   B. persuaded; out       C. intended; up  D. managed; out   答案：C5．分子式为C2H4O2、C3H6O2、C4H8O2、C6H12O2四种物质均属于酯，其碳原子数与同分异构体的关系如图，则y值为（　　）A．16B．18C．19D．20