问题 单项选择题

决定自动冲洗机显影时间的是

A.温控系统
B.干燥系统
C.补充系统
D.传输系统
E.循环系统

答案

参考答案:D

解析: 显影槽内的液面高度是保持恒定的,胶片在显影槽内通过的距离也是固定的。于是胶片在显影槽内的显影时间就是胶片在槽内通过的时间。该时间是由胶片传输系统的速度所决定,传输速度快,显影时间短,传输速度慢,显影时间长。

阅读理解

IS IT TIME TO GET - MP3

Your computer has been playing music for years, one CD at a time.Now hundreds of songs can be stored in your PC if they’re in the MP3 format.

What is it?

MP3 compresses (压缩) music into small computer—friendly files.You access MP3 music several ways: Tunes can be downloaded from websites that have converted (转变) vast music libraries into MP3.Or you can prerecorded CDs into your PC and convert songs in minutes into MP3.Once MP3 music is on your PC’s hard drive, you can play it through your computer’s speakers, “burn” it onto blank CDs or swap (交换) MP3 files with friends using e—mail.

How much?

Software needed to play and convert MP3 music is often free.It is preinstalled (预先安装)on most new computers or can be downloaded from many websites, including MP3, com.Some MP3 sites are free.Just type at around $50 and can hold hundreds of songs.A blank CD on which you can record music costs about a dollar.

Advantages

MP3 turns your home PC into a jukebox (自动唱机).Tiny MP3 players are the size of a deck of cards, making it easy to take hundreds of songs with you.

Disadvantages

You may find that music at many sites is limited.And some only allow you to listen rather than download offerings.Others let you download music that then can’t be copied to MP3 players.And a growing number of new CDs make it impossible to copy songs to a computer.

小题1:How can you get Mp3 music?

A.By turning your home PC into jukebox.

B.By taking you own music or songs with you.

C.By copying songs to a PC through the speakers.

D.By downloading from websites which have converted music libraries.小题2:Which is NOT true according to the passage?

A.Software needed to play and convert MP3 music is often free of charge.

B.MP3 music can be “burned” onto bland CDs or swapped with friends by e-mail.

C.MP3 music can be taken along while traveling.

D.A greater number of new CDs make it possible to copy songs to a computer.小题3:How much will you pay for a MP3 player?

A.Free of charge

B.Free downloading

C.At least fifty dollars

D.About a dollar小题4:What is the closest meaning of the underlined word “burn”?

A.Copy

B.Play

C.Store

D.Change

单项选择题