问题 解答题

甲乙两盒中各有一些小球,如果从甲盒中拿出10个放入乙盒,则乙盒球就是甲盒球数的6倍,若从乙盒中拿出10个放入甲盒,乙盒球数就是甲盒球数的3倍多10个,求甲乙两盒原来的球数各是多少?

答案

设甲盒原来有x,乙盒原来有y盒,

由题意得,

6(x-10)=y+10
3(x+10)+10=y-10

解得:

x=40
y=170

答:甲乙两盒原来的球数为40个,170个.

阅读理解

People who cannot tell all colors apart are said to be color-blind. Most color-blind people can see yellows and blues, but confuse reds with green. It is very rare for a person to be blind to all colors, but they may see everything in shades of black, white and gray.

It is interesting to point out that many color-blind people don’t even realize that they are color-blind, they don’t know that the colors they are seeing and naming are not the actual colors that people with normal vision can see. This can be dangerous when a color-blind person confuses the red and green of a traffic light.

Color blindness is thought to be inherited(遗传)and although doctors have tested color blindness, there is no cure to treatment for it.

小题1:There are four cards here, and each has two colors. Which card’s colors do you think a color-blind person can tell correctly?

A.Red, Green

B.Green, Yellow

C.Red, Brown

D.Brown, Yellow小题2:A color-blind person______.

A.always knows how color-blind he is

B.often gives the wrong name of colors

C.see everything as the same color

D.can hardly see something of strong colors小题3:It’s especially dangerous for a color-blind person to cross a street when_____

A.it is crowded

B.it is a dark night

C.there are no traffic lights at the cross of the streets

D.the traffic light turns red小题4:A person who is color-blind is believed to have something to do with_____.

A.his old age

B.his poor eyesight

C.his parents or grandparents

D.his living condition小题5:Up to now, doctors______.

A.have found a way to prevent a person from getting color-blind

B.have found a way to free a person from his color blindness

C.have been able to tell whether a person is color-blind or not

D.have made it quite clear the cause of color blindness

单项选择题