2020春英语必修4（人教版）习题：单元质量评估（二）+解析

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