A、Because it is higher than the income of the average American families. B、Because farmers have little money left after paying a

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问题  
The farm economy of the United States has changed a lot in tile last seventy years. In the 1930s, 25 percent of the nation’s population lived on farms (32) . Today less than one percent of Americans do.
    Farm incomes have changed over the years too. For example, in 1933, people living and working on farms had much less money to spend than other Americans. At that time, farm families had about one-third the income of non-farmers after all necessary expenses had been paid. By the late 1970s, however, that difference had almost disappeared (33) .
    In 2004, farmers had their best year ever. The United States Department of Agriculture says the average farm family earned about 81,000 dollars. That is more than the average American family, which earned about 60,000 dollars. Yet these numbers do not completely explain the situation for all farmer.. Those who have small farms often take other jobs to earn extra income. And farm earnings for large farms grew faster than for small ones (34) .
    The Department of Labor measures the pay of industrial workers differently. It measures the average hourly and weekly pay for industrial workers. This is because factory workers are generally paid by the hour unlike farmers who earn income from their farm businesses. Industrial workers are about 23 percent of the labor force. But that number has been decreasing (35) .  Most Americans have jobs that provide services. Professional technical and other services employ about 76 percent of the labor force.

选项 A、Because it is higher than the income of the average American families.
B、Because farmers have little money left after paying all necessary expenses.
C、Because the situation in small farms and large farms is quite different.
D、Because 2004 is the best year for farm families.

答案C

解析 题目问为什么美国普通农民家庭的收入情况不能说明所有农民的情况。从"Those who have small farms often take other jobs to earn extra income And farm earnings for large farms grew faster than for small ones"可以看出大小农场的收入情况是各不相同的,不能一概而论。
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