關(guān)鍵詞：托福寫作滿分作文|托福寫作滿分作文范文|托福寫作滿分作文模板 　　Although?they?comprise?only?37?%?of?the?world'?s?total?land?area,?Europe?and?Asia?make?up?79%?of?the?population.?This?implies?a?much?greater?population?density?on?the?whole.?For?countries?on?these?two?continents?than?for?others,?Antarctica,?for?example,?contributes?9%?to?the?total?land?area,?but?0%?to?world?population.?Similarly?q?the?continents?of?North?&?South?America,?Africa,?and?the?regions?labelled?Oceania,?each?support?much?lower?populations?than?might?be?expected?if?land?area?is?the?sole?factor?controlling?distribution.?obviously,?there?must?be?other?critera?which?influence?human?distributions. 　　Not?all?of?the?land'?s?surface?is?amenable?to?development?and?settlement?by?mankind.?The?world'?s?mountain?ranges,?for?example?are?too?hostile?to?allow?major?population?centers?to?develop.?While?it?is?not?impossible?to?live?there,?they?can?only?support?a?limited?number?of?people.?Another?inhospitable?type?of?surface?would?be?desert.?Once?again,?due?to?adverse?conditions,?it?is?hard?for?people?to?live?in?large?numbers?in?the?desert. 　　Climate?is?a?factor?which?should?not?be?neglected?in?the?analysis?of?this?problem.?It?was?alluded?to?in?deserts,?as?they?are,?in?part,?climate-induced.?However,?there?are?large?areas?which,?even?if?they?did?not?count?-as?desert?(or?arid),?would?be?uninhabitable.?I?refer,?of?course,?to?Greenaland?and?Antarctica.?Both?of?these?are?in?the?strictest?sense,?deserts;?neither?receives?much?precipitation?in?the?course?of?a?year.?However,?the?stronger?influence?in?these?areas?is?temperature.?They?are?each?too?cold?to?support?the?complex?array?of?plant?and?animals,?mankind?needs?in?order?to?flourish. 　　Food?supply,?and?some?raw?materials,?are?also?linked?both?to?climate?and?to?human?population?density.?Where?conditions?favor?the?development?of?abundant?nutritional?sources?and?raw?materials?such?as?wood,?man?is?likely?to?be?found,?and?in?great?numbers.?In?areas?where?these?commodities?are?scarce,?man?will?not?be?so?evident. 　　While?these?are?not?the?only?parameters?which?control?the?distribution?of?human?populations?accessibility.?Climate,?and?availability?of?the?basic?necessities?of?life?are?important?considerations.?On?continents?where?these?combine?favorably,?man?has?settled?in?great?numbers.?Where?these?are?not?as?well?developed,?mankind?tends?to?be?more?thinly?distributed.?Europe?and?Asia?seem?to?have?the?closest?to?optimum?combination,?while?Antarctica?appears?to?be?uninhabitable.