Theideathatredmeansstopandgreenmeanshasinfluencedourliv...

问题详情：

The idea that red means stop and green means has influenced our lives in more ways than just traffic signals(信号). We have been taught from a young age that the color red means danger and green means it's okay to move forward. But why were those colors chosen for traffic lights in the first place? For something we have to look at every day, why couldn't they have been prettier colors?

Well, it's import to know that before traffic lights for cars, there were traffic signals for trains. At first, railway companies used red to mean stop, white to mean go, and green to mean warn. As you could imagine, trains ran into a few problems with white meaning go. For example, one train mistook a bright star for a white light and something unexpected happened. Because of that, railway companies finally moved green meaning go and used yellow to mean warn. And it's been that way ever since.

Red has always been a color that mean danger, long before cars were even around. This most likely started because it's the color with the longest wavelength(波长) so it can be seen somewhere farther than other colors.

But, believe it or not, yellow was once used to mean stop. Back in the 1900s, some stop signs were yellow because it was too hard to see a red sign in a poorly lit area. Finally, highly reflective materials(高反*材料) were developed and red stop signs were born. Since yellow can be seen well at all times of the day, school zones, some traffic signs, and school buses continue to be printed yellow.

So next time you are impatiently waiting at a traffic light, don't get so mad at them, they've certainly come a long way.

根据材料内容选择最佳*。

31．What were traffic signals for before traffic lights for cars?

A．Trains                    B．Boats.                    C．Planes                    D．Bicycles

32．Which of the following colors meant go at first?

A．Red.                      B．Yellow.                  C．White.                   D．Green.

33．Why does red mean danger?

A．Because it's the brightest color.                    B．Because it can be seen far away.

C．Because railway companies say so.              D．Because it has the shortest wavelength.

34．Why are school buses painted yellow?

A．Because yellow is a prettier color.

B．Because yellow once meat danger.

C．Because yellow can be seen well in daytime.

D．Because yellow means it's OK to go forward.

35．What does the text mainly tell us?

A．How important traffic lights are.

B．Which color has the longest wavelength.

C．What red, yellow and green can be used for.

D．Why traffic lights are red, yellow and green.

【回答】

31．A

32．C

33．B

34．C

35．D

【分析】

本文介绍了交通灯不同颜*信号所代表的意义。最开始时，以红*作为停止，绿*作为*告，白*作为通行。但是一列火车在晚上把星星误认为白*，因此发生了不好的事情，最后将红*作为停止，绿*作为通行，黄*作为*告。

31．A

细节理解题。根据it's import to know that before traffic lights for cars，there were traffic signals for trains．可知在汽车交通灯出现之前，交通信号灯是为火车设置的。故选A。

32．C   

细节理解题。根据white to mean go可知白*意味着可以通行，故选C。

33．B

细节理解题。根据第三段This most likely started because it's the color with the longest wavelength（波长） so it can be seen somewhere farther than other colors．"可知红*波长最长，比其他颜*能在更远的地方被看见，可以更远的地方*告有危险，故选B。

34．C

细节理解题。根据yellow can be seen well at all times of the day可知校车涂成黄*，是因为在一天的任何时候都可以看到黄*。故选C。

35．D

概括归纳题。根据But why were those colors chosen for traffic lights in the first place？可知主要介绍信号灯为什么是红、黄河绿*。故选D。

点睛：根据题干要求，在文中寻找*所在的语句，进行分析理解，词义猜测，推理判断和概括归纳，选出正确的选项。例如小题2，根据white to mean go可知白*意味着可以通行，故选C。

知识点：未分类

题型：阅读理解