小敏在某次投篮中，球的运动路线是抛物线y= $\frac{1}{5}$x²+3.5的一部分（如图），若命中篮圈中心，则他与篮底的距离l是（　　）

        One day, when Zhou Kai’s mother saw him ____ (head) towards the front door without a jacket on, she eyed him with____ (anxious). She asked him____ (put) on my jacket and he did ____ he was told.

         His mother always makes sure the family eat ____ . For example, they have fish four times a week. Zhou Kai very ____ (rare) gets colds but last week he had____  bad cold and a bit of a fever. How come? That’s____ he was stupid____  to play football in the rain. So you can see how crazy he is____  football.

人体耳垂离生（A）对连生（a）为显性，眼睛棕色（B）对蓝色（b）为显性．一位棕眼离生耳垂的男人与一位蓝眼离生耳垂的女人婚配，生了一个蓝眼耳垂连生的孩子，倘若他们再生育，未来子女为蓝眼离生耳垂、蓝眼连生耳垂的几率是（　　）

如图是最简单的电话装置的示意图，图中甲表示的是　____ 　，乙表示的是　____ 　，在话筒里的金属盒内装满了　____ 　．