问题 单项选择题

数字激光唱盘的标准采样频率为44.1kHz,若量化位数为20位,立体声,一分钟 CD-DA音乐所需存储量为______。

A.12300000B

B.13300000B

C.13230000B

D.22130000B

答案

参考答案:C

解析: 估算声音数字化后每秒所需存储量(未经压缩)的公式为:存储量:采样频率×量化位数/8。若使用双声道,则存储量增加1倍。对于本题,则有(44.1×1000×20×2×60)/8 =13230000字节。

阅读理解

Read and choose. (选择正确的答案) 

     Bob is a middle school student. He studies in a middle school in the east suburbs (郊区) of California.

Bob goes to school from Monday to Friday. On weekdays, he always gets up at 7:00 o'clock, then he

has breakfast. He usually has a cup of milk, a piece of bread and two fried eggs for his breakfast. At

about 8 : 00 0'clock, he gets into his father's car and his dad drives it down the road towards his school.

Classes begin at 8 :30 and at 12 :30, he goes to the school canteen for lunch. In the afternoon,  when

classes are over,  Bob usually plays basketball with his classmates. Sometimes he also goes to the school

library to do some reading. In the evening, Bob may either watch an interesting TV program or do some

Internet surfing(冲浪). He goes to bed at 10 :00. His school days are busy, but he always enjoys them

very much.

1. Where does Bob live?          

A. He lives in a school.

B. He lives in California.

C. He lives in China.

2. How many days does Bob go to school in a week?              

A. Seven days.          

B. Six days.          

C. Five days.

3. Does Bob go to school by bus?           

A. No, he doesn't. His father drives him to school.

B. Yes, he does.

C. No, he doesn't. He goes to school by bike.

4. What does Bob do after classes?              

A. He goes home.

B. He plays basketball everyday.

C. He usually plays basketball and he also goes to the library.

5. Does Bob like his schooldays?              

A. Yes, he does.

B. No, he doesn't.

C. Just so-so.

6. What's the Chinese meaning of the word "canteen" ?           

A. 搡场                

B. 餐厅            

C. 图书馆

单项选择题