8.The idea that red means stop and green means has influenced our lives in more ways than just traffic signals(信號).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 important 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(波長) 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(高反射材料) 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.
根據(jù)材料內(nèi)容選擇最佳答案.
56.What were traffic signals for before traffic lights for cars?A
A.Trains
B.Boats.
C.Planes
D.Bicycles
57.Which of the following colors meant go at first?C
A.Red.
B.Yellow.
C.White.
D.Green.
58.Why does red mean danger?B
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.
59.Why are school buses painted yellow?C
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.
60.What does the text mainly tell us?D
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.
分析 文章大意:這是一篇說明文,主要介紹幾種顏色信號代表的意義.最開始時,以紅色作為停止.綠色作為警告,白色作為通行,但是一列火車在晚上把星星誤認為白色,因此發(fā)生了不好的事情,最后將紅色作為停止,綠色作為通行,黃色作為警告.很多警示牌都是黃色的,因為黃色白天更容易被看到.
解答 56.答案:A.細節(jié)理解題.根據(jù)第二段第一句it's important to know that before traffic lights for cars,there were traffic signals for trains.重要的是要知道,在汽車交通燈出現(xiàn)之前,火車上有交通信號燈.可知,是火車.選A.
57.答案:C.細節(jié)理解題.根據(jù)根據(jù)第二段第二句white to mean go白色意味著行.可知,是白色.選C.
58.答案:B.細節(jié)理解題.根據(jù)第三段This most likely started because it's the color with the longest wavelength(波長) so it can be seen somewhere farther than other colors."在汽車還沒出現(xiàn)之前,紅色一直是一種危險的顏色,這很可能是因為它是波長最長的顏色,所以它比其他顏色更遠.",可知,紅色波長最長,能看得很遠,選B.
59.答案:C.細節(jié)理解題.根據(jù)倒數(shù)第二段第二行yellow can be seen well at all times of the day黃色在白天的任何時候都能看得很清楚.可知,校車涂成黃色是因為白天可以看到黃色.選C.
60.答案:D.主旨大意題.根據(jù)第一段倒數(shù)第二句句But why were those colors chosen for traffic lights in the first place?但是為什么這些顏色首先被選為交通燈呢?及短文內(nèi)容,可知主要介紹信號燈為什么是紅、黃河綠色.選D.
點評 閱讀題型,要注重句子與句子之間、段落與段落之間邏輯關(guān)系以及對篇章的整體理解.根據(jù)所給問題選擇正確選項完成試題.