卫生类模拟试题：阅读理解Population Densities
The average population density of the world is 47 persons per square mile. Continental densities range from no permanent inhabitants in Antarctica to 211 per square mile in Europe. In the western hemisphere， population densities range from about 4 per square mile in Canada to 675 per square mile in Puerto Rico. I n Europe the range is from 4 per square mile in Iceland to 831 per square mile I n the Netherlands. Within countries there are wide variations of population dens ities. For example， in Egypt， the average is 55 persons per square mile， but 1，3 00 person inhabit each square mile in settled portions where the land is arable. High population densities generally occur in regions of developed industri alization， such as the Netherlands， Belgium， and Great Britain， or where lands a re intensively used for agriculture， as in Puerto Rico and Java. Low average population densities are characteristic of most underdeveloped countries. Low density of population is generally associated with a relatively low percentage of cultivated land. This generally results from poor quality land s. It may also be due to natural obstacles to cultivation， such as deserts， moun tains， or malaria (疟疾)-infested jungles; to land uses othe r than cultivation， as pasture and forested sand; to primitive methods that limit cultivation; to so cial obstacles; and to land ownership systems which keep land out of production. More ***nomically advanced countries of low population density have， as a rule， large proportions of their populations living in urban areas. Their rural population densities are usually very low. Poorly developed countries of corresp ondingly low generally population density， on the other hand， often have a conce ntration of rural population living on arable land， which is as great as the rur al concentration found in the most densely populated industrial countries.
31、Along the banks of the Nile， we may expect to find____
A.1300 persons.B. Few inhabitants.
B.few inhabitants.
C.pyramids.
D.many settlements.
32、(同31题)The most densely populated continent is____
A.Asia.
B.Africa.
C.Europe.
D.North America.
33、(同31题)There are no permanent inhabitants in Antarctica because____
A.it is too hot.
B.It is too cold.
C.there is no transportation.
D.it has only recently been discovered.
34、(同31题)In highly industrialized communities， we may expect_____
A.large rural areas.
B.urban development.
C.epidemics.D. Arable land.
D.arable land.
35、(同31题)Puerto Rico is a land of____
A.heavy industrialization.
B.poverty.
C.intense agriculture.
D.large cities.