求一篇关于你对外来人口大量涌入城市的看法的英语作文

TheProblemofHumanPopulation

Directions:Forthispart,youareallowed30minutestowriteacompositionbasedonthefollowinggraphshowingthegrowthoftheworld＇spopulation.Theopeningsentenceisgivenandyouarerequiredtodevelopitintoafullcomposition.Yourpartofwritingshouldbenolessthan120words.Someusefulwordsandphrasesareprovided,butyoudonothavetoincludeallofthem.

(Suggestedwordsandphrases:birthcontrol,deathrate,populationexplosion,foodshortage)

TheProblemofHumanPopulation

Ithasbeenestimatedthatathousandyearsagotherewerelessthan400millionpeopleonearth.Today,however,theworld＇spopulationhasamountedto5,000million.Whatisworse,itkeepsgrowingatasurprisingspeed.Ifthistrendcontinues,theworld＇spopulationwillshootupto7,000millionbytheyear2000.Thisiswhatwecallpopulationexplosion.

Therapiddevelopmentofscienceandtechnologyisthemaincauseofpopulationexplosion.WecanseethatthepopulationhasbeengrowingatatremendousspeedsincetheIndustrialandAgricultureRevolutionin1650,whichraisedthepeople＇sstandardofliving,andtheemergenceofmodernmedicinein1550,whichloweredthepeople＇sdeathrate.

Populationexplosionwillresultinalotofsuchproblemsasfoodshortage,housingshortageandunemployment.Itistimethatweactedquicklytocarryoutthepolicyofbirthcontrolotherwise,man＇ssurvivalontheearthwillbethreatened.