问题 单项选择题

铸造3/4冠的固位力主要依靠()

A.邻面的宽度

B.切缘沟的位置

C.邻面或牙长轴平行

D.邻沟越长,固位越好

E.以上均不正确

答案

参考答案:D

解析: 邻沟的主要作用是阻止3/4冠舌向脱位,沟越长固位越好。

阅读理解

阅读理解。

     One evening Mr Black was driving his car around the country. He wanted to find a small hotel.

Then he saw an old man at the side of the road. He stopped his car and said to the old man. "I want to

go to the Sun Hotel. Do you know it?" "Yes," The old man answered. "I'll show you the way."

     He got into Mr Black's car, and they drove about 12 miles. When they came to a small house, the

old man said. "Stop here."

     Mr Black stopped and looked at the house. "But this isn't the hotel." He said to the old man.

     "No," The old man answered. "This is my house. And I'll show you the way to the Sun Hotel. Turn

around and go back nine miles. Then you'll see the Sun Hotel on the left."

1.That evening Mr Black wanted to stay the night ______.

A. at the old man's house

B. at a hotel    

C. at his own house  

D. in his car

2. Mr Black stopped his car because ______.

A. he saw a friend

B. the lights were red

C. he saw an old man

D. he wanted to look for a hotel

3. The old man took Mr Black ______.

A. to his own house

B. to Mr Black's house

C. to the Sun Hotel

D. to the bus stop

4. When they passed the hotel, the old man didn't stop Mr Black because ______.

A. he wanted to get home

B. he didn't know the hotel

C. he didn't see the hotel

D. he wanted to make fun of Mr Black

5. The old man didn't tell Mr Black how to get to the Sun Hotel, did he?

A. No, he didn't.

B. Yes, he did.    

C. No, he did.   

D. Yes, he didn't.

单项选择题 A2型题