2022年自考专业(英语)英语阅读（一）考试真题及答案20

2022年自考专业（英语）英语阅读（一）考试真题及答案—\ Careful Reading(40 points, 2 points for each)Directions: Read the fol

2022 年自考专业（英语）英语阅读（一）考 试 真题及答案 —\CarefulReading(40points,2pointsforeach)Directions:Readthefollowing passagescarefully.Decideonthebestanswersandwritethecorrespondingletters onyourAnswerSheet. 1PassageOneQuestions1to5arebasedonthefollowingpassage.Although 、 nooneiscertainwhymigrationoccurs,thereareseveraltheories.Onetheoryis baseduponthepremisethatprehistoricbirdsoftheNorthernHemispherewere forcedsouthduringtheIceAge,whenglacierscoveredlargepartsofEurope,Asia, andNorthAmerica.Astheglaciersmelted,thebirdscamebacktotheir homelands,spentthesummer,andthenwentsouthagainastheiceadvancedin winter.Intime,themigrationbecameahabit,andnow,althoughtheglaciershave disappeared,thehabitcontinues.Anothertheoryproposesthattheancestral homeofallmodernbirdswasthetropics.Whentheregionbecame overpopulated,manyspecieswerecrowdednorth.Duringthesummer,therewas plentyoffood,butduringthewinter,scarcityforcedthemtoreturntothetropics. Amorerecent GeorgiaseaislandthatsidledandleanedinJupiterLightswithoneofitsroofless