1.A)Manyescapedfromfarmsandbecamewild.
B)TheywereactuallynativetoNorthAmerica.
C)Manygotkilledinthewildwhensearchingforfood.
D)TheywerehuntedbySpanishandRussianexplorers.
第二题
2.A)Theyoftenmakesuddenattacksonpeople.
B)Theybreakupnature'sfoodsupplychain.
C)Theycausemuchenvironmentalpollution.
D)Theycarryagreatmanydiseases.
第三题
3.A)Theylivedpeacefullywithwildpigs.
B)Theyranoutoffoodcompletely.
C)Theyfellvictimtoeagles.
D)Theyreproducedquickly.
查看答案
1.A)。猪并非原产于北美，它们最初是由来自西班牙和俄罗斯的探险者和定居者引入加利福尼亚的。在早期，人们允许猪自由走动寻找食物，这种做法也使得许多猪从农场逃到野外生活。因此，答案为A)。
2.D)。野猪每年造成数百万美元的作物损失，它们还携带着许多威胁人类和家畜的疾病，因此答案为D)。
查看听力原文
第1题
PigsarenotnativetoNorthAmerica.TheywerefirstintroducedtoCaliforniabySpanishandRussianexplorersandsettlersmanycenturiesago.Intheearlytimes,pigswereallowedtowanderfreelyinsearchoffood.Thispracticealsoallowedmanypigstoescapefromfarmsandliveinthewild,whichbecameaproblem.
1.WhatdowelearnaboutearlypigsinNorthAmerica
第2题
Wildpigscausemillionsofdollarsincropdamageyearly.Theyalsoharbordozensofdiseasesthatthreatenbothhumansandfarmanimals.
2.Whyarewildpigsathreattohumans
第3题
OnoneparticularUnitedStatesisland,wildpigsthemselvesbecameanattractivefoodsourceforaspeciesofmainlandeagle.Theeaglesbeganbreedingontheisland,andalsofeedingonaspeciesofnativefox.Thefoxeswerealmostwipedoutcompletely.
3.WhatdoesthepassagesayaboutthenativefoxesontheUSisland