humanbeings,theyaresmartenoughtolearncertainthings.

Dogsareextremelyusefulascompanionsforblindpeople.Whenadoghasbeenproperly

trained,hewillalwaysleadhisblindmasterintherightdirectionandkeephimoutof

danger.Forexample,seeing-eyedogslearnnevertocrossabusyroadwhencarsarecoming,

eveniftheirmasterorderedthemtodoso.

Horsesarealsoabletolearnmanythings.Horsesthatareusedforguardorpolice

dutymustlearnnevertobefrightenedofnoises,traffic,andotherdisturbances.Racing

horsesareabletorunmuchfasterthanotherhorses,buttheyarealsoquitehighstrung

(易紧张).Therefore,itisnecessaryforthosepeoplewhotrainthemtobeverypatient

(耐心)andunderstanding.

Themovingpicturesandtelevisioncanusetrainedanimalstoo.Someanimals,suchas

monkeysandfoxes,areeasytofilm.Allyouhavetodoismakeatrailinfrontofthe

camerabydraggingsomethingthatsmellsgoodtotheanimalsovertheground.Biganimals,

suchaslionsandtigers,canbephotographedastheyboundhappilybacktotheirfamilies

anddinner.Ifamovieactorisnearby,thewell-trainedanimalwillpaynoattentionto

him.However,theaudiencemayimaginethattheactorescapedaterribledeathbytheskin

ofhisteeth.

B.toobeyonlysafeorders

C.nevertocrossroads

D.tocrossroadwhenorderedtodoso

B.smallerthanotherhorses

C.cleverthanotherhorse

D.morenervousthanotherhorses

B.givetheanimalacertaintask

C.ordertheanim