单项选择题

A．The differences between sheep and cattle breeding.
B．Living conditions in the colony of Massachusetts.
C．Food shortages in the early 1800s.
D．Livestock raising on early American farms.
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单项选择题
A．The situation.B．The solution.C．The recommendation.D．The office building.
A．The situation.
B．The solution.
C．The recommendation.
D．The office building.
单项选择题
A．Replacing the native corn with the hybrid corn.B．Replacing the hybrid corn with the native corn.C．Replacing the new type of corn with the traditional corn.D．Replacing the traditional corn with the native corn.
A．Replacing the native corn with the hybrid corn.
B．Replacing the hybrid corn with the native corn.
C．Replacing the new type of corn with the traditional corn.
D．Replacing the traditional corn with the native corn.
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