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单项选择题 1. interface DoStuff2 {  2. float getRange(int low, int high); }  3.  4. interface DoMore {  5. float getAvg(int a, int b, int c); }  6.  7. abstract class DoAbstract implements DoStuff2, DoMore { }  8.  9. class DoStuff implements DoStuff2 {  10. public float getRange(int x, int y) { return 3.14f; } }  11.  12. interface DoAll extends DoMore {  13. float getAvg(int a, int b, int c, int d); }  What is the result?() 

A、 The file will compile without error.

B、 Compilation fails. Only line 7 contains an error.

C、 Compilation fails. Only line 12 contains an error.

D、 Compilation fails. Only line 13 contains an error.

E、 Compilation fails. Only lines 7 and 12 contain errors.

F、 Compilation fails. Only lines 7 and 13 contain errors.

G、 Compilation fails. Lines 7, 12, and 13 contain errors.

  • A
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