更新时间：2018-06-04 16:30作者：李一老师
B.livedmainlyinthesouthofAmerica
C.didgreatharmtothenaturalenvironment
D.werethelargestbirdpopulationintheUs
25.Theunderlinedword“undoing”probablyreferstothepigeons’____.
A.escapeB.ruinC.liberationD.evolution
26.Whatwasthemainreasonforpeopletokillpassengerpigeons?
A.Toseekpleasure.B.Tosaveotherbirds.
C.Tomakemoney.D.Toprotectcrops.
27.WhatcanweinferaboutthelawpassedinMichigan?
A.Itwasignoredbythepublic.B.Itwasdeclaredtoolate.
C.Itwasunfair.D.Itwasstrict.
C
Atypicalliontamer（驯兽师）inpeople’smindisanentertainerholdingawhip(鞭)atachair.Thewhipgetsallofthea