肺癌大多起源于

A、肺毛细血管
B、肺小动脉
C、肺小静脉
D、支气管粘膜上皮
E、支气管软骨
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正确答案:

D

答案解析:

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Intheearlieststagesofman'sdevelopmenthehadnomoreneedofmoneythananimalshave.Hewascontentwithverysimpleformsofshelter,madehisownroughtoolsandweaponsandcouldprovidefoodandclothingforhimselfandhisfamilyfromnaturalmaterialsaroundhim.Ashebecamemorecivilized,however,hebegantowantbettershelter,moreefficienttoolsandweapons,andmorecomfortableandmorelastingclothingthancouldbeprovidedbyhisownneighborhoodorbytheworkofhisownunskilledhands.Forthesethingshehadtoturntotheskilledpeoplesuchassmiths,leatherworkersorcarpenters.Itwasthenthatthequestionofpaymentarose.

Atfirsthegotwhathewantedbyasimpleprocessofexchange.Thesmithwhohadnotthetimetolookafterlandorcattlewasgladtotakemeatorgrainfromthefarmerinexchangeforanaxeoraplough.Butasmoreandmoregoodswhichhadnofixedexchangevaluecameonthemarket,exchangebecametoocomplicatedtobesatisfactory.Anotherproblemarosewhenthosewhomadethingswantedtogetstocksofwoodorleather,oriron,buthadnothingtoofferinexchangeuntiltheirfinishedgoodswereready.Thusthedifficultiesofexchangeledbydegreestotheinventionofmoney.Insomecountrieseasilyhandledthingslikeseedsorshellsweregivenacertainvalueandthefarmer,insteadofpayingthesmithforanewaxebygivinghimsomemeatorgrain,gavehimsomanyshells.Ifthesmithhadanyshellsleftwhenhehadboughthisfood,hecouldgetstocksoftherawmaterialsofhistrade.Insomecountriesquitelargethingssuchascowsorcamelsorevenbigflatstoneswereusedfortrade.Later,piecesofmetal,bearingvaluesaccordingtotherarityofthemetalandthesizeofthepieces,orcoinswereused.Moneyasweknowithadarrived.

1.Exchangeofgoodsbecamedifficultbecause_________.

Amanbecamemorecivilized

Bsmithsbegantolookafterlandorcattleintheirsparetime

Cmoreandmoregoodswhichhadnofixedexchangealuescametothemarker

Dfarmershadn'tenoughgrainormeattoprovidefor

skilledworkers

2.Moneywasnotuseduntil_______.

Apaperwasinvented

Bpeoplepracticedasimpleprocessofexchange

CnothingcouldbeofferedinexchangeDtheexchangeofonethingforanotherbecametoocomplicated

3.Thebesttitleforthispassageis_____.

AWhatismoney

BWhataremoney'sfunctions.

CTheimportanceofmoney

DThebeginningofmoney

Coca-Colafoundthatemployeeswhoparticipatedinwellnessandexerciseprogramsusedfewersickdaysandtendedtobemoreproductiveontheirjobs.

Ateachofits20buildingsatits200-acrecampusinRaleigh,NorthCarolina,SASInstituteprovidescoffeebreakroomsstockedwithfreesoda,freshfruit,M&Msandpastries.

We'dliketoexpressourdesiretoestablishbusinessrelationshipwithyouonthebasisofquality,mutualbenefitandexchangeofneededgoods.

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