题目内容：
请根据下面短文回答第题： Mr. Black was young and able. The boss liked him. Last month he was sent to China on business. Before hewent back from China, he decided to buy something for Tony, the son of his boss. At first he didn' t know what tobuy for the boy. Suddenly he remembered that the boy liked birds very much, so he went to the bird market. Hewas glad to find that there were so many kinds of birds there. He bought four beautifulbirds, then he told the boyabout it on the telephone.
As soon as Mr. Black returned to London by air. he went to Tony with the four birds. But on his way to theboss' s home, one of them flew out of the cage (笼子) and there were only three birds left in it. Then Mr. Black,bought a local (当地的) bird to take the place of the missing Chinese one.
Tony of course was very happy when he saw the birds. But soon he found one of them was different from theother three. He asked, "It' s a local bird, isn' t it, Mr. Black.'?"
"Yes, it is. " Mr. Black answered, "It' s an interpreter (译员). "
Why did the boss send Mr. Black to China on business? A．Mr. Black had never been to China before.
B．Mr. Black was an able and hard-working man.
C．Mr. Black could buy something interesting for Tony.
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