问题 单项选择题

假设CD光盘片的存储容量为600MB,上面存放的数字图像能以每秒25幅画面 (每幅画面为360×240×65536色的分辨率)播放1小时,则CD盘片上的数字图形的压缩比大约是( )。

A.25倍

B.10倍 (

C.50倍

D.100倍

答案

参考答案:A

解析: 每幅画面的点数为360×240=86400,每点色彩为65536,共需要16位即 2个字节来表示。每幅画面所需存储量位86400×2B=172800B=168.75KB,这样1小时所需存储器容量位168.75×25×60×60=15187500KB=14831.5MB,该容量是600MB,CD光盘片的14831.5MB÷600MB≈25倍。

完形填空

Not long ago, I made up my mind to read a lot of books to get more knowledge. So I went to the library and __1___ happily with several books. But after a few days, I felt impatient. The ___2__ of finishing all of them seemed impossible, because I always found it hard to ___3__ down to read a whole book. I didn’t know what to do with it. Then ___4___ one day I thought of “Why not make reading for fun?” it gave me __5___ again. Reading is a journey of spirit. Every time we read a book, we are actually(事实上) talking ___6___ the writer. I tried to put all my effort into his or her books, __7___ I could feel all of his or her happiness and sadness. Now books have become a part of my life.

Attitude (态度) can make a great ___8___. Someone once said, “Even though the situation is bad, people still have one freedom(自由) to __9___ their attitude.” So, don’t complain about study or work. It helps __10___. Try to see things from a different way. I’m sure this will change the situation and help you a lot.

(    )1. A. sang        B. jumped      C. returned      D. danced

(    )2. A. way        B. habit        C. suggestion    D. idea

(    )3. A. calm        B. sit          C. lie          D. turn

(    )4. A. sadly        B. quickly      C. suddenly     D. hardly

(    )5. A. advice       B. hope        C. time         D. knowledge

(    )6. A. with         B. about       C. of           D. at

(    )7. A. because      B. though      C. but          D. so

(    )8. A. decision      B. difference   C. discussion     D. promise

(    )9. A. announce     B. choose      C. show         D. hide

(    )10. A. nothing     B. anything     C. everything     D. something

多项选择题