Urbanization and ItsInfluence

Over half theworld's people now live in cities.The latest"Global Report on HumanSettlements"says a significant change took place last year. Thereport________(51)this

week fromU.N.Habitat,a United Nations agency.

A centuryago,________(52)than five percent of all people lived in cities.________(53)the middle of this century it could be seventy percent,or ________(54)six and ahalf

billion people.

Already three一fourths of peoplein________(55)countries live in cities.Now most urban population________(56)isin the developing world.

Urbanization canlead to social and economic progress,but also put________(57)on cities toprovide housing and________(58).The new report says almost two hundred

thousand peoplemove________(59)cities and towns each day.It says worseninginequalities,________(60)by social divisions and differencesin________(61),could result in

violence and crimeunless cities plan better.

Another issue isurban sprawl（无序扩展的城区）.Thisis where cities _________ (62) quickly into rural areas,sometimes________(63)amuch faster rate than urban

population growth.

Sprawl is common inthe United States.Americans move a lot.In a recent study,Art Hall at the University of Kansasfound that people are moving away from the________

(64)cities tosmaller ones.He sees a________(65)toward"de-urbanization"across thenation._________(62)

A.expand

B.invade

C.split

D.enlarge