单项选择题

A. Get the professor’s approval.
B. Start writing right now.
C. Come up with another idea.
D. Ask friends for help.
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单项选择题
A. The killer and sperm whales are toothless. B. The humpback whale is toothed.C. The dolphin is toothed. D. The porpoise is toothless.
A. The killer and sperm whales are toothless.
B. The humpback whale is toothed.
C. The dolphin is toothed.
D. The porpoise is toothless.
填空题
A variety of social problems are closely linked to poverty. It is well (36) that children who grow up in poverty are more likely to be involved in (37) activities, have higher teenager pregnancy rates, exhibit lower academic (38) and suffer from a (39) of other social problems than those who do not grow up in poverty. The size of the population may also have important (40) for the overall competitiveness of the American economy, not only because it brings the (41) tax burden, but also because immigrants (42) poverty level wages clearly do not have the kind of skills necessary to compete in an (43) global marketplace. In addition to the impact on American society in general, (44) . Very high poverty rates suggest that a significant proportion of immigrants are unable to succeed in the modern American economy. This is particularly important because without a change in immigrant policy, (45) . Of course, the poverty rates for immigrant households do not tell us exactly how those admitted in the future will fare. However, looking at past immigrants (46) .
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