专升本英语阅读训练.doc

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1、专升本英语阅读训练Passage1Populationtendstogrowatanexponential(指数的)rate.Thismeansthattheyprogressivelydouble.Asanexampleofthistypeofgrowthratetakeonepennyanddoubleeverydayforonemonth.Afterthefirstweek,youwouldhaveonly64cent,butafterthefourthweekyouwouldhaveoveramilliondollars.T

2、hishelpsexplainwhythepopulationhascomeon“allofasudden”tookfromhebeginningofhuman1ifetotheyear1830forthepopulationoftheearthtoreachonebillion.Thatrepents(缓慢进行)atimespanofatleasttwomillionyears.Thenittookfrom1830to1930forworldpopulationtoreach2billion.Thenextbillionwasad

3、dedby1960onlythirtyyearsandin1975worldpopulationreached4billionwhichisanotherbillionpeopleinonlyfifteenyears.Worldpopulationisincreasingatarateof9,000perhour,220,000perdayand80millionperyear.Thisisnotonlyduetohigherbirthrate,buttolowerdeathrateaswell.Thenumberofbirthsh

4、asnotdeclinedatthesamerateasthenumberofdeaths.SomecountriessuchasColumbia,Thailand,Morocco,CostaRicaandthePhilippinesaredoublingtheirpopulationabouteverytwenty-oneyearswithagrowthrateof3.3percentayearormore.TheUnitedStatesisdoublingitspopulationaboutveryeighty-sevenyea

5、rs,witharateof0.8percentperyear.Everytimeapopulationdoubles,thecountryinvolvedneedstwiceasmuchofeverything,includinghospitals,schools,resources,foodandmedicinestocareforitspeople.Itiseasytoseethatthisisverydifficulttoachieveforthemorerapidlygrowingcountries.1.Thispassa

6、gechieflydiscussesA.thegrowthofworldpopulation.B.onetypeoftheexponentialrate.C.thepopulationproblemofmorerapidlygrowingcountries.D.thepossiblewaysofdealingwiththerapidpopulationgrowth.2.Accordingtothepassagewhathelpstoexplainwhythepopulationproblemhascomeon“allofasudde

7、n”?A.Thepennythatdoublesitselfeverydayforonemonth.B.Thetimespanofat1easttwomillionyearsinhumanhistory.C.Anillustrationoftheexponentgrowthrategivenbytheauthor.D.Thelargeamountofmoneyyouwouldluckilymakeafterthefourthweek.3.Ittookfortheworldtoincreaseitspopulationfrom1bil

8、lionto4billion.A.100yearsB.175yearsC.1975yearsD.overtwomillionyears4.WhichofthefollowingstatementsisNOTtrue?A.Worldpo