Thousandsofyearsago,peopledidn’tliveincoldplacesbecausetheydidn’tknowhowtokeepthemselveswarm.(几千年前,因为人们不知道怎么保持自己温暖,所以他们不住在寒冷的地方.)Latertheylearnedtomakeclothes.(不久后,他们学会了做衣服.)whenananimalwaskilled,theymadeuseof(能看出原材料的"由.做成")itsskinstocovertheirbodies.(他们杀死动物后,用它们的皮做成衣服穿在身上.)Theskinskeptthemwarm.(动物的皮使他们保持暖和.)

　　Natureispeople’sgoodfriend.(大自然是人们的好朋友.)Itoncehelpedpeoplefindfire,whenlightninghitaforestandstartedafire.(当闪电使森林着火时,大自然帮助人们找到了火种.)Peopletooksomeofthisfiretotheirhomes.(人们带着一些火种回家.)Thefirekeptthemwarm,andalsofrightenedwildanimals.(火给人们温暖,也吓走了野兽.).Soonpeoplefoundthefoodcookedtastedmuchbetter,sotheybegantousethefiretocookfood.(不久,人们发现被煮的食物更好吃,所以他们开始用火种煮食物.)

　　Butpeoplestilldidn’tknowhowtomakeafire.(但是人们仍然不知道怎么取得火源.)whentheygotafirefromtheforesttheytriedtokeepitburning.(当他们从森林里得到火种,他们试着让火种一直燃烧.)Ifitwentout,theyhadtowaitforyears.(如果火灭了,他们不得不再等待许多年.)

　　Butlatertheyfounddifferentwaystomakefire.(但是不久后,他们发现了取火种的不同方法.)Forexample,theymadefirebyburningwoodorknockingtwopiecesofstones.(例如,他们转木取火或者凿石取火.)

　　Todayit’seasyforpeopletomakefirebecausetheyhavematches,lightersanddifferentkindsofheaters.(现在,取火种对人来说非常简单.因为人们有火柴,打火机和各种各样的打火器.)Theycanmakefireatanytimetheyneed.(现在能随时点火了.)

　　（C）91.Oncepeoplelivedonlyinhotplacesbecausetheydidnotknowhowto______.

　　A.killanimalsB.takefirefromforest.C.keepthemselveswarm.D.makematches.

　　课文第一句话:peopledidn’tliveincoldplacesbecausetheydidn’tknowhowtokeepthemselveswarm.

　　because后面的就是答案.

　　（D）92.Peopleuseanimalskins_____inthosedays.

　　A.forfood.B.tomakefire.C.forburning.D.towarmthemselves.

　　第一段最后一句话:Theskinskeptthemwarm.

　　显然是动物的皮毛是保持他们温暖的.

　　（A）93.Peoplelaterlearnedhowtousefireto______.

　　A.cookfood.B.killanimals.Ccutoffananimal’sskin.D.burnwood.

　　第二段最后一句:theybegantousethefiretocookfood

　　人们用火干什么,人们用火煮食物.课文原话.

　　（B）94.Peoplelaterlearnedtomakefirebyburning(题里的boring打错了吧)_____.

　　A.stonesB.wood.C.dryleaves.D.animalskins.

　　倒数第二段最后一句:theymadefirebyburningwoodorknockingtwopiecesofstones

　　里面的burning+wood而knocking+stones.

　　（A）95.Todaymostpeopleintheworlduse____tomadefire.

　　A.heaters.B.matchesorlighters.C.stones.D.lightning.

　　虽然课文说了matchesorlighters,但是最后说differentkindsofheaters,显然后面说的是总称.所以要选总的称呼.