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Given： 10. interface Jumper { public void jump（）； } ...   20. class Animal {} ...   30. class Dog extends Animal {   31. Tail tail；   32. }   ...   40. class Beagle extends Dog implements Jumper{   41. public void jump（） {}  42. }   ...   50. class Cat implements Jumper{   51. public void jump（） {}   52. }. Which three are true？（）
A: Cat is-a Jumper
B: Cat is-a Animal
C: Dog is-a Jumper
D: Dog is-a Animal
E: Beagle has-a Jumper
F: Cat has-a Animal
G: Beagle has-a Tail

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出自：Oracle认证

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