What is the lecture mainly about？
A. Commercials on television
B. Marketing brand-name products
C. A book by Rob Frankel
D. Selling Aunt Ruby's chicken
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Why does the man go to see his professor？
A. To take a makeup test for a class that he missed
B. To explain why he has been absent from class
C. To turn in an extra credit project to the professor
D. To ask the professor how to bring up his grade
Which of the following is the main topic of the lecture？
A progressive view of agriculture"
B. The conditions for the development of agriculture
C. A comparison of hunter-gatherers and farmers
D. The negative effects of agriculture on early farmers
A．graduatedB．studiedC．trainedD．gained
A. graduated
B. studied
C. trained
D. gained
其他条件相同，低收入国家增加一单位资本很可能比高收入国家增加的收入多。
A. 正确
B. 错误
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