缺词填空
1.Venus(金星）isournearestneighbourins_____.It'sonly42millionkilometersaway.Weknowthatinsomeways:Venusinl_______theearth.Venusgoesroundthesun.It'sa_______asbigastheearth,too.Ino_______ways,thetwoplanetsareverydifferent.Venusliesunderverythickcloudsofdust.Thecloudsholdthes________heatunderthem.Insomeplaces,thet_______goesupto280centigrade.
Earthpeoplecan'tlivew_________air,butourneighbourplanetdoeshavethisk_______ofair.Thereisveryl_______weatheronVenus.Still,somescientistsbelievemicrobes(微生物)maybea_______toliveonVenus.Theyarenots_______aboutthise________onething:earthpeoplecannotliveonVenus.
2.Sheepusuallylivetobeabouteightyearsold.Theydon'tliketobea________.That'swhytheyliveingroups.Sheepareverygentleanimals.Peoplewhoraiseandcareforsheeparec______shepherds(牧羊人).Sometimes,shepheardshaved________tohelptakecareofthesheep.Thedoglearnstoroundupthesheep.Whenonecannotfindthewayhome,thedogb_______itback!
Whenal_________isborn,theshepherdmakessureitgetsofftoagoodstartinlife.Thesheephasbeenafriendtopeopleforover10000years.Sheepgivepeoplebothm________andclothing.Therearemanykindsofsheep.
Somepeopleraisesheepformeat,andothersfortheirw________.Sheepeatgrass.Sheepusuallygiveb________onceayearandhaveonetothreebabysheep.Babysheepgotomarketwhentheyarebetween90and120pounds.Woolp_______peoplefromcoldandwetweather.Evenifyourwoolsweatergetsw_______fromsnowofrain,itwillstillkeepyouwarm.