2020春英语必修4(人教版)习题:单元质量评估(二)+解析
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2020-02-07 18:05:04
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单元质量评估(二)单元质量评估(二)时间:100分钟分数:120分第一部分第一部分阅读理解阅读理解(共两节,满分(共两节,满分40分)分)第一节第一节(共(共15小题;每小题小题;每小题2分,满分分,满分30分)分)阅读下列短文,从每题所给的四个选项(阅读下列短文,从每题所给的四个选项(A、B、C和D)中,选)中,选出最佳选项。出最佳选项。AGuamisabeautiful,smallislandinthePacificOcean.You'llfindhappysongbirds,clearbluewater,andleafyforestthere.Butthesmallislandhasabigproblem:snakes.Thereareabout2millionbrowntreesnakeslivinginGuam.Thesnakeslikelyarrivedinthe1940s.Theyprobablyslipped(滑(滑行)行)unseenontoshipsandplanesheadingtoGuam.Oncethere,thesnakeslaideggs.Snakefamiliesgrew.ThesnakeshavenonaturalenemiestoeatthemonGuam.Soon,theislandwascoveredwiththesesnakes.Thebrowntreesnakehashadadevastatingeffect.Thesnakeseatbirds.Thereusedtobe12kindsofbirdsontheisland.Butthesesnakeshavekilledoffninekindsofthebirds.Thesnakescangrowtobe10feetlong.Theyoftenbitehumans.Theyclimbontopowerlinesandmaketheelectricitygoout.Thiscausesmillionsofdollarsindamage.Scientistshavetriedmanydifferentwaystocontrolthenumberofsnakes.Theyhaveusedsnaketrapsandsnake-sniffingdogs.Nothingseemedto
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