1．What is the new challenge to American agriculture?

　　A．Fewer and older farmers.

　　B．Higher fuel prices.

　　C．More natural disasters.

　　D．Lower agricultural output.

　　【解析】　细节理解题。由文中第一段第三句“The country's farmers are getting older, and there are fewer people standing in line to take their place.”可知农民越来越老，越来越少的人去接替他们的位置，所以A项符合文意。由文中第一段第二句“It has little to do with the usual challenges, such as flood, rising fuel prices and crop­eating insects.”可以排除B项；C项和D项原文未提及。

　　【答案】　A

　　2．Why is Merrigan visiting universities across the country?

　　A．To draw federal agriculture officials' attention.

　　B．To select qualified agriculture graduates.

　　C．To clarify a recent blog posting.

　　D．To talk more students into farming careers.

　　【解析】　细节理解题。由文中第二段第一句“...in hopes of encouraging more students to think about careers in agriculture.”可知Merrigan希望更多的大学生从事农业，所以D项符合题意。

　　【答案】　D

　　3．According to Matt Rush, American agriculture will provide opportunities for younger people because ________.

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