问题 单项选择题

声源与接收体作相对运动时产生的频移现象称为()。

A.自然反射

B.混响

C.多普勒效应

D.传播

E.入射角度

答案

参考答案:C

解析:此题考查的是多普勒效应的概念。声源(反射体)与接收体作相对运动时,接收体在单位时间内收到的振动次数(频率)会发生改变的现象称为多普勒效应。

阅读理解

阅读理解。

Dear David,

     How are you? I'm fine. I'm in London, at the International School of English. I'm in Class 3 with eight

other students. They're from different countries---Spain, America, and Thailand. Our teacher' s name is

Henry. He's very nice. He's a very good teacher.

     I'm living with an English family. Mr and Mrs Brown have three children. Tom is fourteen, Kate is twelve,

and Andrew is seven. They are all very friendly, but it isn't easy to understand them.

     London is very big and interesting. The weather is good---cold but sunny---and the parks are beautiful!

Hyde Park, and Green Park are all in the city center. English food is OK, but the coffee is very bad!

     Write to me soon. 

                                                                                                                                             Truly,

                                                                                                                                             Paula

1. From the letter we know there are _____ students in Paula's class.

A. seven

B. eight

C. nine

D. ten

2. The students are studying _____ in the school.

A. Chinese

B. Japanese

C. French

D. English

3. Paula has a very good teacher. His name is _____.

A. Kate

B. Andrew

C. Brown

D. Henry

4. There are three children in the English family and _____ is the youngest one.

A. Kate

B. Tom

C. Andrew

D. Peter

5. Which one is NOT right?

A. There are two parks in London.

B. The weather is cold but fine in London.

C. Paula doesn't like the coffee.

D. Paula is living with an English family.

单项选择题 A1/A2型题