阅读理解。Doyouknowwhydifferentanimalsorpests(昆虫)havetheirspecialcolors?Colorsinthemseemtobeusedmainlytoprotectthemselves.Somebirdslikeeatinglocusts(蝗虫)butbirdscannoteasilycatc

　　阅读理解。

　　Doyouknowwhydifferentanimalsorpests(昆虫)havetheirspecialcolors?Colorsinthemseemtobe

　　usedmainlytoprotectthemselves.

　　Somebirdslikeeatinglocusts(蝗虫)butbirdscannoteasilycatchthem.Why?Itisbecauselocusts

　　changetheircolorstogetherwiththechangeofthecolorsofcrops(庄稼).Whencropsaregreenlocustslook

　　green.Butastheharvesttimecomeslocustschangetothesamebrowncolorascropshave.Someotherpests

　　withdifferentcolorsfromplantsareeasilyfoundandeatenbyothers.Sotheyhavetohidethemselvesforlives

　　andappearonlyatnight.

　　Ifyoustudytheanimallifeyou'llfindthemainuseofcoloringistoprotectthemselves.Bearslionsand

　　otheranimalsmovequietlythroughforests.Theycannotbeeasilyseenbyhunters(猎人).Thisisbecausethey

　　havethecolorsmuchlikethetrees.Haveyouevernoticedanevenstrangeract?Akindoffishintheseacan

　　sendoutakindofveryblackliquid(液体)whenitfacesdanger.Whiletheliquidspreadsover(散开)its

　　enemies(敌人)cannotfindit.Anditimmediatelyswimsaway.Soithasliveduptonowthoughitisnotstrong

　　atall.

　　1.Fromthepassagewelearnthatlocusts________.

　　[ ]

　　A.aresmallanimals

　　B.areeasilyfoundbybirds

　　C.aredangeroustotheirenemies

　　D.changetheircolorstoprotectthemselves

　　2.Howcanpestswithdifferentcolorsfromplantskeepoutofdanger?

　　[ ]

　　A.Theyrunawayquickly

　　B.Theyhavethecolorsmuchliketheirenemies

　　C.Theyhidethemselvesbydayandappearatnight

　　D.Theyhavetomovequietly

　　3.Bearsandlionscankeepsafebecause_________.

　　[ ]

　　A.theyhavethecolorsmuchlikethetrees

　　B.theymovequietly

　　C.theylikebrownandgraycolors

　　D.theyliveinforests

　　4.Whycanthekindoffishliveuptonow?

　　[ ]

　　A.Becauseitisveryandstrong.

　　B.Becausetheliquiditsendsoutcanhelpitescapefromitsenemies.

　　C.Becausetheliquiditsendsoutcankillitsenemies.

　　D.Becauseitswimsfasterthananyo