Which three demonstrate an “is a” relationship？（） [" public class X { } public class Y extends X { }"," public interface Shape { } public interface Rectangle extends Shape{ }"," public interface Color { } public class Shape { private Color color； }"," public interface Species { } public class Animal { private Species species； }"," public class Person { } public class Employee { public Employee（Person person） { }"," interface Component { } class Container implements Component { private Component[] children； }"]
（）是互联网最本质的文化。 ["分享","传播","尊重人性","尊重知识"]
健康教育
脑震荡
三过家门而未进的是（） ["尧","舜","禹"]
青枝骨折
