问题详情

完成下列各选项(I)Everycountryhasitsownculture.Eventhougheachcountryusesdoors.Doorsmayhave16functionsandpurposeswhichleadto17differences.WhenIfirstcametoAmerica,Inoticedthatapublicbuildinghadtwodifferent18andtheyhaddistinctfunctions.Youhavetopushthedoorwiththeword"PUSH"togooutofthebuildingandtopullthedoorwiththeword"PULL"to19thebuilding.Thiswasnewtome,be-causeweusethe20doorinsouthKorea.Forquiteafewtimes1failedtogooutofashoppingcentreandwasembarrassed.Thewayofusingschoolbusdoorswasalso21tome.Iusedtotaketheschoolbustoclasses.Theschooldecidedthatwhenthedriveropenedboththefrontandbackdoors,22whoweregettingoffthebusshouldgetofffirst,andstudentswhoweregettingonshouldgeton23InsouthKorea,wedonotneedtowaitforpeopletogetoff.Onemorning,Ihurriedtothebus,andwhenthebusdoorsopened,I24triedtogetontheschoolbusthroughthefrontdoor.Allthestudentsaroundlookedatme,Iwastotally25,andmyfacewentred.
A.different
B.important
C.practical
D.unusual
请帮忙给出正确答案和分析，谢谢！