题目

圈出下列每组中不同类的单词1. how you we2. to by go3. bike foot bus4. often do does5. car dog pig6. walk school come 答案：【答案】1. how 2. go 3. foot 4. often 5. car 6. school【解析】略设抛物线上一点P到y轴的距离是4，则点P到该抛物线的焦点的距离是  (     )A．6 B．4 C．8 D．12