If class Donkey2 is invoked twice， the first time without assertions enabled， and the second time with assertions enabled， what are the results？（） 
- A、no output
- B、no output assert is on
- C、assert is on
- D、no output ， An Assertion Error is thrown.
- E、assert is on ， An AssertionError is thrown.
正确答案:C
答案解析:有
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