[单项选择]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. In Europe the range is from 4 per square mile in Iceland to 831 per square mile in the Netherlands. Within countries there are wide variations of population densities. For example, in Egypt, the average is 55 persons per square mile, but 1,300 persons inhabit each square mile in settled portions where the land is arable.
High population densities generally occur in regions of developed industrialization, such as the Netherlands, Belgium, and Great Britain, or where lands are 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
A. 1,300 persons
B. few inhabitants
C. pyramids
D. many settlements

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[单项选择]

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. In Europe the range is from 4 per square mile in Iceland to 831 per square mile in the Netherlands. Within countries there are wide variations of population densities. For example, in Egypt, the average is 55 persons per square mile, but 1,300 persons inhabit each square mile in settled portions where the land is arable.
High population densities generally occur in regions of developed industrialization, such as the Netherlands, Belgium, and Great Britain, or where lands are intensively used for agriculture, as in Puerto Rico and Java.
Low a
A. 1,300 persons
B. few inhabitants
C. pyramids
D. many settlements

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[单项选择]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. In Europe the range is from 4 per square mile in Iceland to 831 per square mile in the Netherlands. within countries there are wide variations of population densities. For example, in Egypt, the average is 55 persons per square mile, but 1,300 persons inhabit each square mile in settled portions where the land is arable.
High population densities generally occur in regions of developed industrialization, such as the Netherlands, Belgium, and Great Britain, or where lands are 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
A. 1,300 persons
B. few inhabitants
C. pyramids
D. many settlements

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[单项选择]Passage 5

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. In Europe the range is from 4 per square mile in Iceland to 831 per square mile in the Netherlands. within countries there are wide variations of population densities. For example, in Egypt, the average is 55 persons per square mile, but 1,300 persons inhabit each square mile in settled portions where the land is arable.
High population densities generally occur in regions of developed industrialization, such as the Netherlands, Belgium, and Great Britain, or where lands are intensively used for agriculture, as in Puerto Ri
A. 1,300 persons
B. few inhabitants
C. pyramids
D. many settlements

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[单项选择]As the population of the world increases and human needs expand, we must take care not to（）all of our natural resources at once.
A. furnish
B. maximize
C. minimize
D. exhaust

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[简答题]China has the greatest population in the world and a large pool of research workers, yet it has not produced a single Nobel Prize winner so far. What has caused this situation in your opinion State your opinion in about 160 words, and write it on the answer sheet.

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[填空题]

As the population of the world keeps on growing, it gets more and more difficult to feed everyone. The United States is one of the lucky countries because it grows enough food for itself and still has enough to export to other parts of the world. One reason for this is that the United States is a large country with a variety of climates. Most of the central part of the country is especially suitable for raising grain. Wheat and corn are the most important crops in the region. The United States exports millions of tons of grain every year. Wheat is used to make bread, a basic food throughout the world. Most of the corn is used to feed animals, which in turn become food themselves.
The southeastern part of the United States has a warm, damp climate. It grows cotton, rice and sugar. Florida specializes in fruits and vegetables. It is famous for its orange, lemons and grape. Florida has warm weather all year round, so it can provide vegetables for t

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