Ifyou’vetriedstudyingwhenyou’retired,youknowthatitcanseemveryimpossibletodowell.Astudyofsleepinsparrowssuggeststherelationshipbetweensleepandtheabilitytolearnmaybemorecomplicated(复杂)thanpeopleknew

　　Ifyou’vetriedstudyingwhenyou’retired,youknowthatitcanseemveryimpossibletodowell.

　　Astudyofsleepinsparrowssuggeststherelationshipbetweensleepandtheabilitytolearnmaybemorecomplicated(复杂)thanpeopleknew.

　　NielsC·Rattenborg,ascientistfromWisconsin-Madison,wantedtofindouthowthesparrowswereabletodealwithgettingsomuchlesssleep.Heandhisteambroughteightwildbirdsintoalabandwatchedthemforoneyear.Theyinventedagametocheckhowwellthebirdscouldlearn.Inthegame,thesparrowshadtopeck(啄)threebuttons（按钮）inarightordertogetafoodtreat.Thescientistsdiscoveredthatthebirds’ abilitytolearntherightbuttonorderdependedon(依靠)twothings:thetimeofyearandtheamountofsleepthebirdshadhad.

　　Duringthemigration（迁徙）season,thesparrowswererestlessatnightandgotmuchlesssleepthanusual.Evenso,theywereabletounderstandhowtogetthefoodquicklyasifthey’dhadaregularnightofsleep.Outsidethemigrationseason,theyfoundthesparrowsthatgotlesssleepthanusualhadmuchmoredifficultylearninghowtogetthefoodtreatsthanbirdsthathadaregularsleep.

　　Theresultsshowthatthesparrowscandealwithmuchlesssleepduringthemigrationseasonthanusual.Ifscientistscanfindoutwhy,theymaylearnfromsparrowsandfindwaysofhelpingpeopledealwithgettingmuchlesssleep.Untilscientistsfullyunderstandtherelationshipbetweensleepandlearning,it’sbettertogetplentyofsleepwhenpreparingforanexam.

　　小题1:Thepassageismainlyabout .A．sparrows’migration.B．sleeplessonsfromSparrows.C．howtogetlesssleepwhilestudyingD．howsparrowsthatgotlesssleepgetfoodtreats小题2:Whycansparrowsgetmuchlesssleepduringthemigrationseason?A．Theyeatmore.B．TheclimateisbetterC．TheycangetfoodquicklyD．Scientistsstilldon’tknowthereason.小题3:Whatfactdoesthepassageleadyoutobelieve?A．Weshouldsleepaslittleassparrowsdo.