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。

阅读理解

As prices and building costs keep rising, the“do-it-yourself”(DIY)trend(趋势)in the U.S. continues to grow.

“We needed furniture(家具)for our living room,” says John Ross,“and we just didn’t have enough money to buy it. So we decided to try making a few tables and chairs.” John got married six months ago, and like many young people these days, they are struggling to make a home at a time when the cost of living is very high. The Rosses took a 2-week course for $280 at a night school. Now they build all their furniture and make repairs around the house.

Jim Hatfield has three boys and his wife died. He has a full time job at home as well as in a shoe making factory. Last month, he received a car repair bill for $420.“I was deeply upset about it. Now I’ve finished a car repair course, I should be able to fix the car by myself.”

John and Jim are not unusual people. Most families in the country are doing everything they can to save money so they can fight the high cost of living. If you

want to become a “do-it-yourselfer”, you can go to DIY classes. And for those who don’t have time to take a course, there are books that tell you how you can do things yourself.

小题1:We can learn from the text that many married people_________.

A.find it hard to pay for what they need

B.have to learn to make their own furniture

C.take DIY courses run by the government

D.seldom go to a department store to buy things小题2:When the writer says that Jim has a full-time job at home, he means Jim_________.

A.makes shoes in his home

B.does extra work at night

C.does his own car and home repairs

D.keeps house and looks after his children小题3:Jim Hatfield decided to become a do-it-yourself when__________.

A.his car repairs cost too much

B.the car repair class was not helpful

C.he could not possibly do two jobs

D.he had to raise the children all by himself小题4:What would be the best title for the text?

A.The Joy of DIY

B.You Can Do It Too!

C.Welcome to Our DIY Course

D.Ross and Hatfield Believers in DIY

单项选择题 A1/A2型题