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Abouttenmenineveryhundredhavethetroubleofcolorblindnessinsomeway.Womenareluckieronlyaboutoneintwohundredisaffected（感染）inthismatter.Perhapsafterallitissafertobedrivenbyawoman.

Therearedifferentkindsofcolorblindness.Forexampleamancannotseedeepred.Hemaythinkthatredorangeandyellowareallshades(影子)of green.Sometimesapersoncan’ttellthedifferencebetweenblueandgreen.Onlyafewunluckymenmayseeeverythinginshadesofgreen—astrangeworldindeed.

Colorblindnessinhumanbeingsisadifferentthingtoexplain.Inonlyoneeyetherearemillionsofverysmallthingscalled“cones（锥状细胞）”.Thesehelpustoseeinthebrightlightandtotelldifferencesbetweencolors.Thesearealsomillionsof“rods“（杆状细胞），buttheseareusedforseeingwhenitisnearlydark.Theyshowusshapesbutnotcolors.

Someinsectshavefavoritecolors.Mosquitoes(蚊子)likebluebutdonotlikeyellow.Aredlightwillnotattractinsectsbutabluelightwill.Humanbeingsalsohavefavoritecolors.Yetwearelucky.Withthehelpoftheconesinoureyeswecanseemanybeautifulcolorsbydayandwiththehelpoftherodswecanseeshapesatnight.

1.“Colorblindness”means inChinese.

A.盲目 B.无色 C色盲 D讨厌颜色

2.Somepeoplesayit’ssafertobedrivenbywomenbecause .

A.womendrivemorecarefully

B.womenarebetteratdrivingthanmen

C.womencanseethingsmoreclearly

D.therearefewercolor—blindwomen

3.Withthehelpofthe“cones”wecan .

A.telldifferentshapes B.killinsets

C.seeinthedark D.tellorangefromyellow

4.Wecanattractandkillmosquitoesbyusinga light.

A.red B.yellow C.blue D.green

5.WhichofthefollowingsentencesaboutcolorblindnessisTRUE?

A.Noneofmencanseedeepred.

B.Notallofmenhavethesameprobleminrecognizingcolors.

C.Noneofmencantellthedifferencebetweenblueandgreen.

D.Allofmenseeeverythinginshadesofgreen.