英语阅读题~Aroundtheworldtwothirdsofthepeoplearefarmers.mostofthemengageinsubsistencefarming.Thismeansthattheyraiseplantsandanimalstofurnishtheirfamilieswithfoodandothersupplies.Theyconsumetheirvariedoutputand

英语阅读题~

Aroundtheworldtwothirdsofthepeoplearefarmers.mostofthemengageinsubsistencefarming.Thismeansthattheyraiseplantsandanimalstofurnishtheirfamilieswithfoodandothersupplies.Theyconsumetheirvariedoutputandhavelittletosellortotradeforothergoods.Subsistencefarmswerecommonintheunitedstatesatonetime,buttherearefewsuchfarmstoday.

Twothirdsofamericanfarmerspracticecommercialfarming.Commercialfarmsproduceabout97percentofthecountry’sagriculturalgoods.Thesefarmsareoperatedmuchlikeotherindustries.Themembersofthefarmfamilyproducethecommodities(商品)thatwillbesenttothemarket.Theyselltheirproductsandbuythethingstheyneed.

Somecommercialfarmsarebigfactoriesinthefield.Theymaybeownedbyacompanyorbyanindividualasaninvestment.Mostamericanfarms,however,arestilloperatedbyfamilies.Afarmermayownorrenthisland.

Inacountryaslargeastheunitedstates,farmsvarywidelyinclimate,landsurface,soil,watersupply,conveniencetomarket,andothercharacteristics.Differentregionsmayhavedifferentkindsofspecializedfarms.Specializedfarmersconcentrateonthekindoffarmingbestsuitedtothelandandclimate,totheirtechnicalskills,andtothemoneytheyinvestinthefarm.

However,noregionislimitedtoasingletypeoffarm.Indeedfewfarmsarelimitedtoonecroporcommodity.Whereoutputisvariedandnoonekindofcroporcommodityproducesmorethanhalfofafarm’sincome,itisclassifiedasageneralfarm.thegeneralfarmergrowsvariedcropstousethedifferentkindsofsoilsorsurfacesonhislandandtoemployhistimeandmachinerymostefficiently.

26．Subsistencefarmers______

[a]growcropsfortheirfamilies'ownuse

[b]sellalotoftheirproductsformoney

[c]tradetheirvariedoutputforothergoods

[d]usetheiragriculturalproductsascommodities

27．Subsistencefarms______.

[a]areverypopularintheunitedstatesnow

[b]arestillcommoninmanypartsoftheworld

[c]consistoftwothirdsofthetotalnumberofthefarmsintheworldtoday

[d]usedtobethemajorformoffarmingintheworld

28．America