英语阅读练习Doyouknowwhydifferentanimalsorpests(昆虫)havetheirspecialcolors?Colorsinthemseemtobeusedmainlytoprotectthemselves.Somebirdslikeeatinglocusts(蝗虫),butbirdscannoteasilycatchthem.Why?Itisbecauseloc
英语阅读练习
Doyouknowwhydifferentanimalsorpests(昆虫)havetheirspecialcolors?Colorsinthemseemtobeusedmainlytoprotectthemselves.
Somebirdslikeeatinglocusts(蝗虫),butbirdscannoteasilycatchthem.Why?Itisbecauselocustschangetheircolorstogetherwiththechangeofthecolorsofcrops(庄稼).Whencropsaregreen,locustslookgreen.Butastheharvesttimecomes,locustschangetothesamebrowncolorascropshave.Someotherpestswithdifferentcolorsfromplantsareeasilyfoundandeatenbyothers.Sotheyhavetohidethemselvesforlivesandappearonlyatnight.
Ifyoustudytheanimallife,you'llfindthemainuseofcoloringistoprotectthemselves.Bears,lionsandotheranimalsmovequietlythroughforests.Theycannotbeeasilyseenbyhunters(猎人).Thisisbecausetheyhavethecolorsmuchlikethetrees.
Haveyouevernoticedanevenstrangeract?Akindoffishintheseacansendoutakindofveryblackliquid(液体)whenitfacesdanger.Whiletheliquidspreadsover(散开),itsenemies(敌人)cannotfindit.Anditimmediatelyswimsaway.
1:Whydolocustschangetheircolors?____________
2:Howmanyanimalswhocan'tchangeprotectthemselves?_____________
3:Accordingtothepassage,whatcolourmaylocustsbeinsummer?_____________
4:Whatotherwayscananimalsprotectthemselves?(youmayuseChinesehere)________