综合填空：用方框内所给词的适当形式填空，使短文意思完整、正确。(每小题1分，共10分)

One day a visitor came to Nasreddin’s house.  “I am your cousin小题1: Konya,” he said, “and I have brought you a duck to小题2: the visit”  Nasreddin was小题3: .  he asked his wife to cook the duck, and served the visitor a小题4: dinner.

The next day another visitor arrived.  “I am the friend of the man who brought you the duck.” He said. Nasreddin invited him in and gave小题5: a good meal.  The next day another visitor arrived, and said he was the friend of the friend of the man who had brought the duck.  Again Nasreddin invited him in for a meal.   小题6: , he was getting a bit angry. 小题7: seemed to be using his house as a restaurant.

Then another visitor came, and said he was the friend of the friend of the friend of the man who had brought the duck.  He was小题8: in.  Nasreddin’s wife brought some小题9: to the table and the visitor tasted it.  “What kind of soup is this?  It小题10: just like warm water.”  “Ah!” said Nasreddin, “That is the soup of the soup of the soup of the duck.”

我国原发性肝癌的最主要原因是（）

A.黄曲霉素

B.酒精性肝硬化

C.血色病

D.丙型肝炎

E.乙型肝炎