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多项选择题 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

  • B,F
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