下面MIDI与MP3文件的描述中错误的是______。A．MIDI是一种使用符号表示_爱下问搜题

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问题单项选择题

下面MIDI与MP3文件的描述中错误的是______。

A．MIDI是一种使用符号表示的、由计算机合成的音乐

B．播放.mid文件时，乐曲是由PC机中的声卡合成出来的

C．MP3是一种经过压缩编码的波形声音

D．.wav文件表示波形声音，所以MP3文件后缀也是.wav

答案

参考答案：D

解析：MP3音乐的文件后缀是.mp3。

完形填空

完形填空。
     My name is Li Lei. I am a student. I    1    in No.1 Middle School.    2    six grades in our school. I am
in    3   . I go to school    4    in the morning. There are four    5   in the morning and tow in the afternoon. We study Chinese, maths, English and    6    lessons.There are    7    teachers    8    school.    9   good
teachers. They work hard  10    us students.

( )1. A. work
( )2. A. I have
( )3. A. class three,
                grade one
( )4. A. in six thirty
( )5. A. teachers
( )6. A. other
( )7. A. two hundred
                and six
( )8. A. at
( )9. A. All they are
( )10. A. for

B. listen
B. These are
B. class Three,
     Grade One
B. in thirty six
B. classes
B. others
B. two hundred
     six
B. for the
B. All them are
B. with

C. study
C. There are
C. grade one,
     class three
C. at six thirty
C. books
C. the other
C. two hundreds
     and six
C. in
C. They all are
C. to

D. read
D. It is
D. Grade One,
     Class Three
D. at thirty six
D. words
D. the others
D. two hundreds
     six
D. in the
D. They are all
D. about

选择题

关于动物在生物圈中作用的叙述中，错误的是[ ]

A．帮助植物传粉和传播种子

B．某些动物能改善土壤

C．促进生态系统物质循环

D．能利用光能合成有机物