A

　　Intheseatherearemanyislands.Initswarmwatertherearesomelittleones.Wecallthem"Coralislands".

　　Acoralislandisverynicetolookat.Itlookslikearingoflandwithtrees,grassandflowersonit.Onepartoftheringisopentothewater.Thereisalittleroundlakeinsidetheisland.

　　Ifyoulookintothislake,youwillseebeautifulcoral.Youmaythinktheyareflowers.

　　Ifyoulookatapieceofcoral,youwillseemanylittleholesinit.Ineachoftheseholesaverysmallseaanimalhaslived.Theseseaanimalsmakethecoral.

　　Theybegantobuildunderthewater.Yearafteryear,thecoralgrewhigherandhigher.Atlastitgrewoutofthewater.

　　Thentheseabroughtitintosmalltreesandsomethingelse.Aftersomeyears,thesethingschangedintoearth.Sometimesthewindbroughtseedstothisearth.Sometimesbirdsflewoveritandbroughtseedstotheisland.

　　Thelittleseedsgrew.Inafewyearstherewereplantsallovertheisland.Inafewmoreyearsthereweretreesgrowingthere.

　　Soyousee,theseislandswerebuiltlittlebylittle.Theworkerswereverysmall.Dotheynotteachusalesson?Canyouthinkwhatthelessonis?

　　56.Acoralislandlookslike_____.

　　A.aroundcakeB.trees,grassandflowersC.aringoflandD.aroundlake

　　57.Thereare______intheholesincorals.

　　A.flowersB.littlecoralsC.grassD.seaanimals

　　58.Howdidseedsoftrees,grassandflowerscometothecoralislands?

　　A.Thewindandbirdsbroughtthemtothecoralislands.

　　B.Onlythewindbroughtthemthere.

　　C.Peoplebroughtthemthere.

　　D.Fishesbroughtthemthere.

　　59.Fromthestorywelearnthat______.

　　A.Smallworkerscannotdobigthing.

　　B.Onlybigworkerscandobigthings.

　　C.Smallworkerscandobigthingsiftheyworkhardandworkalongtime.

　　D.Allsmallthingscandobigthings.

　　B

　　Millionsofyearsago,dinosaurs(恐龙)livedonearth.Atthattime,thewholeearthwaswarmandwet.Thereweregreenforestsandtheycouldfindenoughtoeat.

　　Gradually（渐渐地）,partsoftheearthbecamecoldanddryandtheforeststheredied.Thendinosaurscouldnotfindenoughtoeat.Thismustbeonereasonwhydinosaursdiedout(灭绝).

　　Theremaybeotherreasonsthatwedonotyetknowabout.Scientistsaretryingtomakemorediscoveries（发现）aboutdinosaurs.

　　Wenowknowthatdinosaurswereofmanysizesandshapes.Somewereassmallaschickens,whilesomewereabout90feetlong.

　　Therewerealsoterriblefights（战争）betweendinosaurs!Theymighthavehappenedmorethan100millionsyearsago.Thoughnomanwastheretoseeanyofthefights,wecantellbytheanimals’footprintsthatfightsdidhappen.

　　60.Whendiddinosaursliveonearth?

　　A.ThousandsofyearsagoB.Onemillionyearsago

　　C.MillionsofyearsagoD.Manyyearsago

　　61.Therearemaybemanyreasonsthatthedinosaursdiedout,butthewritertellusonly

　　_______reason(s).

　　A.oneB.twoC.threeD.four

　　62.Scientistsaretryingto________.

　　A.finddinosaurs

　　B.makemoremoney

　　C.makemoredinosaurs

　　D.learnmoreaboutdinosaurs

　　63.Dinosaursoftenfoughteachother.Weknowthatbecause_______.

　　A.theirfootprintstellusso