问题 填空题

已知⊙O1与⊙O2的半径分别为1和3,若O1O2=4,则⊙O1与⊙O2的位置关系是______.

答案

外切

分析:由⊙O1、⊙O2的半径分别为1和3,O1O2=4,根据两圆位置关系与圆心距d,两圆半径R,r的数量关系间的联系即可得出两圆位置关系.

解:∵⊙O1、⊙O2的半径分别为1和3,O1O2=4,

又∵3+1=4,

∴⊙O1与⊙O2的位置关系为外切.

故答案为:外切.

阅读理解

阅读理解。

     In western countries, especially in America, some social customs have lasted still today. For example,

ladies first, that is to say, women in those countries are respected(尊重) in many ways. In the U.S. and

Europe, you will see men usually open doors for women and women generally walk ahead of men into a

room or a restaurant unless the man have to be ahead of the ladies to choose the table, to open the door

of a car or to give other services. On the street, men almost walk or across the street on the side of the

ladies which is closer to traffic, but if a man walks with two ladies, he should walk between them.

1. In this passage "customs" especially refer to _______.

A.what a group of people usually do

B.what people in western countries do

C.what people in eastern countries do

D.what people in united states do

2. When you introduce a group of people in English, you will probably begin with_______.

A. Men and women

B. Women and men

C. Gentlemen and ladies

D. Ladies and gentlemen

3. In which country people may think it strange that men should open doors for women?

A. England

B. Italy

C. Japan

D. Germany

4. Which of the following statements is not true?

A.In Europe, a man generally follows a woman when they enter a restaurant together.

B.In America a man who walks ahead of a women always gives services.

C.In the U.S., women almost always walk closer to the running cars.

D.In the U.S. men should always walk by the side of the ladies.

5. Which of the following statements best expresses the main idea of this passage?

A.In western countries, some social customs have lasted till today.

B.Women in western countries are respected in many ways.

C.Men usually open doors for women in the U.S. as well as in Europe.

D.Men show respect for women by giving them good services.

选择题