| n water for the citizens.
27、(同26题)Which of the following is true? _____
A.The sewage pipes built by the Romans are no longer in use now.
B.Sewage pipes in Arabia were built by the Roman.
C.A sewage pipe still being used today in Rome was built 2,000 year ago.
D.The ancient Romans got their drinking water from underground pipes.
28、(同26题)Which of the following is Not true? ____
A.A government health service was set up in ancient Rome.
B.The first public hospital in Europe was built in Rome.
C.In ancient Rome doctors were paid by the government.
D. Those who were mentally sick were all burnt alive in the Roman Empire.
29、(同26题)From this article we’ ve learned that the Arabs ____
A.made more discoveries than the Romans.
B.helped to preserve the Roman medical works.
C.discovered more about the way the human body works.
D.Occupied big parts of the old Roman lands 2,000 years ago.
30、(同26题)This article is mainly about____
A.the contributions made by the Romans and Arabs to the promotion of public health.
B.how the Arabs invaded the Roman Empire.
C.The rise and fall of the Roman Empire.
D.How Arabian doctors helped to translate the medical books.
31、第三篇 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.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.
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