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      One day, after school, Steven asks Bob a question, " Bob, my mother and father have one son, but I
have no brothers and sisters. Who is it? " Bob thinks it over. But he doesn't know the answer. So he has
to ask Steven the answer. Steven laughs and says, " Of course, it's me. "
      Next day, Bob asks his father the same question, " Dad, you and my mother have one son, but I have
no brothers and sisters. Who is it? " His father answers, " I'm sorry, I don't know." Bob says happily, " Of
course, it's Steven." Oh, stupid Bob!
1. Bob and Steven are               .
[     ]
A. brothers         
B. sisters         
C. classmates
2.                asks the same question again.
[     ]
A. Steven         
B. Bob           
C. Father
3. Steven is a               boy.
[     ]
A. clever           
B. worse         
C. happy
4. Bob's answer is               .         
[     ]
A. left            
B. right           
C. wrong
5. How many daughters do Steven's father and mother have?
[     ]
A. 0.
B. 1.
C. 2.

参考答案:
1-5  C  B  A  C  A