An American went to Paris and bought a picture from a French artist (艺术家). The American thought the picture was very good. But when he came back to his room and was going to put the picture on the wall,he couldn't tell the top from the bottom of the picture. He turned the picture this way and that,but he still didn't know.
      He thought and thought. He hung(悬挂) the picture in the dining room. Then he asked the artist to dinner.When the artist came,the American said nothing to him about the picture,he went with the artist into the dining room to have the meal. When the artist began to eat,he looked at the picture for some time. When he began to eat the fish,he put on his glasses and looked at the picture again. Before he began to eat his apples,he stood up and walked to the picture and looked at it carefully. At last when he began to have his tea,he looked again and found the picture was upside down (颠倒).
      "Why,my friend," he said,"the picture is upside down. "
      "Indeed! But why did it take you so long to find that out?" said the American. "You painted it, didn't you?"

1. The American asked the French artist to dinner because       .

A. he wanted to thank the artist
B. he wanted to ask the artist to draw another picture for him
C. he wanted to know if he hung the picture right
D. he wanted to teach the artist a lesson

2.The artist looked at the picture several times,but he didn't say anything,because       .

A.he couldn't tell the top from the bottom at first, either
B. he thought it was an ugly picture
C. he wanted to say something after the meal
D. he thought it was right to hang the picture like that

3. Which of the following is NOT right?

A. Sometimes even an artist can't tell the top of a picture from its bottom.
B. The American was clever.
C.The French artist gave the picture to the American as a present.
D. The American liked the picture very much.

4. How many times did the artist look at the picture before he found it was wrong?

A. Only once.
B. Twice.
C. Three times.
D. Four times.

5.Why didn't the American ask the artist as soon as he came into the house?

A. Because he thought it would be foolish to do so.
B. Because he didn't want the artist to lose face.
C. Because he knew the picture was upside down.
D. Because he was hungry.