更多" The wide variety of climates"的相关试题:
[单项选择] The wide variety of climates in North America has helped spawn a complex pattern of
soil regions. In general, the realm’’s soils also reflect the broad environmental partitioning
into "humid America" and "arid America." Where annual precipitation exceeds 20 inches
(50 centimeters),soils in humid areas tend to be acidic in chemical content, Since crops
(5) do best in soils that ale neither acidic(higher in acid content) nor alkaline(higher in salt
content).fertilization is necessary to achieve the desired level of neutrality between the
two. Arid America’’s soils are typically alkaline and must be fertilized back toward
neutrality by adding acidic compounds. Although many of these dryland soils, particularly
in the Great Plains, are quite fertile, European settlers learned over a century ago that
(10) water is the main missing ingredient in achieving their agricultural potential. In the
1970’’s, certain irrigation methods were perfected and fina
A. The wide variety of climates
B. Soil types and vegetation patterns
C. Improved irrigation methods and the expansion of agriculture
D. The change in precipitation patterns
[单项选择]Seventeenth-century houses in colonial North America were simple structures that were primarily functional, carrying over traditional designs that went back to the Middle Ages. During the first half of the eighteenth century, however, houses began to show a new elegance. As wealth increased, more and more colonists built fine houses.
Since architecture was not yet a specialized profession in the colonies, the design of buildings was left either to amateur designers or to carpenters who undertook to interpret architectural manuals imported from England. Inventories of colonial libraries show an astonishing number of these handbooks for builders, and the houses erected during the eighteenth century show their influence. Nevertheless, most domestic architecture of the first three-quarters of the eighteenth century displays a wide divergence of taste and freedom of application of the rules laid down in these books.
Increasing wealth and growing sophistication throughout the colon
[单项选择]There is a great concern in Europe and North America about declining standards of literacy in schools. In Britain, the fact that 30 percent of 16 year olds have a reading age of 14 or less has helped to prompt massive educational changes. The development of literacy has far-reaching effects on general intellectual development and thus anything that impedes the development of literacy is a serious matter for us all. So the hunt is on for the cause of the decline in literacy. The search so far has forced on socioeconomic factors, or the effectiveness of" traditional" versus" modern" teaching techniques. The fruitless search for the cause of the increase in illiteracy is a tragic example of the saying" They can’t see the wood for the trees". When teachers use picture books, they ate simply continuing a long-established tradition that is accepted without question. And for the past two decades, illustrations in reading primers have become increasingly detailed and obtrusive, while language
A. young people are showing less interest in higher education
B. students cannot understand modem academic texts
C. academic books are too childish for their undergraduates
D. there has been a significant change in student literacy
