用砂轮盘磨刀，砂轮与刀口之间的摩擦是____ 摩擦；加油站不许用塑料桶灌装汽油是为了防止____ ；在乒乓球比赛中，运动员常用干布擦乒乓球，是为了____ ；坐在行驶的汽车里的乘客突然感到座椅靠背向前压了自己一下，是由于____ ．

过滤时必须使用的一组仪器是（　　）

下列关于季风的描述，正确的有（    ）

  ①季风是一年中风向随季节变化而发生明显变化的风

  ②夏季风能带来丰沛的降水

③热带季风气候主要分布在亚洲南部的印度半岛和中南半岛

  ④亚洲大陆夏季盛行来自大陆内部的偏北风

    This is my home. We have three bedrooms, a living room, a kitchen and a bathroom. In the kitchen, there is a fridge. The vegetables and fruit are in the fridge. The juice is in it, too. In my bedroom, there is a bed, a chair and a computer. Now I'm watching TV in the living room. Mum is cooking in the kitchen. My sister is taking a shower in the bathroom. Our cat is under my bed.