【Whenyoutakeawalkinanycityyouoftenseealotofpeoplewalkingdogs.Itisstilltruethatadogisthemostusefulandfaithfulanimalintheworldbutthereasonwhypeoplekeepadoghaschanged.Intheolddayspeopleusedtotr】

　　Whenyoutakeawalkinanycityyouoftenseealotofpeoplewalkingdogs.Itisstilltruethatadogisthemostusefulandfaithfulanimalintheworldbutthereasonwhypeoplekeepadoghaschanged.Intheolddayspeopleusedtotraindogstoprotect(保护)themselvesagainstattacksbyotherbeasts.Latertheycametorealizethatadogwasnotonlyusefulforprotectionbutwillingtoobeyhismaster.Forexamplewhenpeopleuseddogsforhuntingthedogswouldnoteatwhatwascaughtwithoutpermission.

　　Thesedayspeopleinthecityneednotprotectthemselvesagainstattacksfromanimals.Whydotheykeepdogsthen?Somepeoplekeepdogstoprotectthemselvesfromrobbery（抢劫）.Butthemostimportantreasonisforcompanionship.Forachildadogisabestfriendwhentherearenofriendstoplaywith.Foryoungcouplesadogistheirchildwhentheyhavenochildren.Foroldcouplesadogisalsotheirchildwhentheirnaturalchildrenhavegrownup.Sothemainreasonwhypeoplekeepdogshaschangedfromprotectiontofriendship.

　　67.Accordingtothepassageintheolddayspeopletraineddogs______.

　　forprotectionagainstrobbery

　　justforfun

　　forcompanionship

　　forprotectionagainstotheranimals

　　68.Theword"companionship"maymean______.

　　A.native B.advice C.friendlyrelationship（关系） D.usage

　　69.Thedogswereusedforhuntingbecause______.

　　A.theyweregoodhunters

　　B.theyobeyedtheirmasters

　　C.theywereusefulforprotection

　　D.theydidnoteatotheranimals

　　70.Themostimportantreasonforpeopletokeepdogsnowisthey______.

　　A.needcompanion

　　B.likechildren

　　C.enjoyhunting

　　D.wanttoprotectthemselves

　　71.Wecaninferfromthepassagethat______.

　　A.dogscanbehelpfultothosewhoneedcompany

　　B.citypeoplealwaysfeellonely

　　C.dogscanbeboring（厌烦的）

　　D.thecitycanbeaverydangerousplace