多項(xiàng)選擇題

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 Animal
B. Cat is-a Jumper
C. Dog is-a Animal
D. Dog is-a Jumper
E. Cat has-a Animal
F. Beagle has-a Tail
G. Beagle has-a Jumper

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