C. comprehend
D. support
4. According to the passage, a private-enterprise economy is characterized by ___.
A. private property and rights concerned.
B. manpower and natural resources control.
C. ownership of productive resources
D. free contracts and prices.
5. The passage is mainly talking about ___.
A. how American goods are produced.
B. how American consumers buy their goods.
C. how American economic system works.
D. how American businessman make their profits.
参考答案:DDCAC
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