单项选择题

The land at the farm’s highest elevation is used for which of the following（）

A. Hay and corn
B. Orchard
C. Pasture
D. Woodland
E. Wheat

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单项选择题

If the increase in the number of students enrolled from 1950 to 1960 was half the increase from 1960 to 1970，what was the student enrollment in 1950？（）

A. 745
B. 1，340
C. 1，380
D. 1，435
E. 1，545

单项选择题

If it were discovered that the import dollar amount shown for 1978 was incorrect and should have been $5.3 billion instead，then the average(arithmetic mean)import dollar amount per year for the 17 years would be how much less（）

A. $100 million
B. $53 million
C. $47 million
D. $17 million
E. $7million

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