矿粒与气泡相互粘附有哪两种方式？
参考答案：
气泡与矿粒多次碰撞而粘着；溶解于水中的气体在矿粒表面析出而粘着。
That is the only way we can imagine______ the overuse of water in students' bathrooms.[ ]
A. reducing
B. to reduce
C. reduced
D. reduce
