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1、專升本英語(yǔ)閱讀訓(xùn)練Passage1Populationtendstogrowatanexponential(指數(shù)的)rate.Thismeansthattheyprogressivelydouble.Asanexampleofthistypeofgrowthratetakeonepennyanddoubleeverydayforonemonth.Afterthefirstweek,youwouldhaveonly64cent,butafterthefourthweekyouwouldhaveoveramilliondollars.Thishelpsexplainwhy
2、thepopulationhascomeon“allofasudden”tookfromhebeginningofhuman1ifetotheyear1830forthepopulationoftheearthtoreachonebillion.Thatrepents(緩慢進(jìn)行)atimespanofatleasttwomillionyears.Thenittookfrom1830to1930forworldpopulationtoreach2billion.Thenextbillionwasaddedby1960onlythirtyyearsandin1975wor
3、ldpopulationreached4billionwhichisanotherbillionpeopleinonlyfifteenyears.Worldpopulationisincreasingatarateof9,000perhour,220,000perdayand80millionperyear.Thisisnotonlyduetohigherbirthrate,buttolowerdeathrateaswell.Thenumberofbirthshasnotdeclinedatthesamerateasthenumberofdeaths.61Someco
4、untriessuchasColumbia,Thailand,Morocco,CostaRicaandthePhilippinesaredoublingtheirpopulationabouteverytwenty-oneyearswithagrowthrateof3.3percentayearormore.TheUnitedStatesisdoublingitspopulationaboutveryeighty-sevenyears,witharateof0.8percentperyear.Everytimeapopulationdoubles,thecountry
5、involvedneedstwiceasmuchofeverything,includinghospitals,schools,resources,foodandmedicinestocareforitspeople.Itiseasytoseethatthisisverydifficulttoachieveforthemorerapidlygrowingcountries.1.ThispassagechieflydiscussesA.thegrowthofworldpopulation.B.onetypeoftheexponentialrate.C.thepopula
6、tionproblemofmorerapidlygrowingcountries.D.thepossiblewaysofdealingwiththerapidpopulationgrowth.2.Accordingtothepassagewhathelpstoexplainwhythepopulationproblemhascomeon“allofasudden”?61A.Thepennythatdoublesitselfeverydayforonemonth.B.Thetimespanofat1easttwomillionyearsinhumanhistory.C.
7、Anillustrationoftheexponentgrowthrategivenbytheauthor.D.Thelargeamountofmoneyyouwouldluckilymakeafterthefourthweek.3.Ittookfortheworldtoincreaseitspopulationfrom1billionto4billion.A.100yearsB.175yearsC.1975yearsD.overtwomillionyears4.WhichofthefollowingstatementsisNOTtrue?A.Wor
