Wefinddifferentkindsofanimalsintheworld.Someanimalssuchastigersandlionsliveinbigforestandtheyarecalled__41 animals.Someotherlikesheepanddogsarekeptbymenandtheyarecalleddomesticanimals.Theseanimalsareverydifferentfromoneanotherbutwecan__42 themintobiggroupsthosethateatotheranimalsandthosethateatgrassandleaves.Animalslikethe 43 belongtothefirstgroup.

Animalsareofgreatusetohumanbeings.Men 44 wildanimalsfortheirfurandmeat.Domesticanimalsareevenmoreimportanttomen.Withoutthemlifewillbe 45 .Peoplemakeuseofanimalsinmany 46 .

Cowsanddogsareusefultomen’slife.Theygive80%ofthemeatthatmeneateveryyear.Skinofsomeanimalscanbe47 intoexpensiveovercoatsandshoeswhicharewarmandcomfortableandlastalongtime.Theyareverywelcomeincoldcountries.Woolwhichisnowoneofthemostimportantmaterialsfortextile（纺织）industrycomesfromaspecialkindof 48 .Fromcowswegetmilk.Andweshouldnotforgetthatsomedomesticanimalsarekeptfortransport.Manypeoplealwaysridehorses.Arabsrideoncamelswhichtravelindesertsfordayswithout 49 .Insomeplacesanimalsarestillusedtoploughfield. 50 isclearthatmenjustcan’tlivewithouttheseanimals.

( )41.A.wild B.serious C.terrible D.fighting

( )42.A.separate B.divide C.change D.make

( )43.A.chick B.tiger C.fish D.goat

( )44.A.hunt B.discover C.raise D.carefor

( )45.A.smooth B.difficult C.easy D.perfect

( )46.A.ways B.groups C.places D.kinds

( )47.A.put B.turned C.made D.changed

( )48.A.sheep B.goats C.cows D.animals

( )49.A.resting B.eating C.sleeping D.stopping

( )50.A.That B.This C.It D.So