单项选择题

A．Planting crops.
B．Clearing new land.
C．Building houses.
D．Caring for animals.
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单项选择题
A．They eat or destroy plants.B．They provide plants with continued oxygen supply.C．Their manure is eaten by plants.D．Their manure improves the quality of soil which plants live on.
A．They eat or destroy plants.
B．They provide plants with continued oxygen supply.
C．Their manure is eaten by plants.
D．Their manure improves the quality of soil which plants live on.
单项选择题
A．The differences between sheep and cattle breeding.B．Food shortages in the early 1800’s.C．Living conditions in the colony of Massachusetts.D．Livestock raising on early American farms.
A．The differences between sheep and cattle breeding.
B．Food shortages in the early 1800’s.
C．Living conditions in the colony of Massachusetts.
D．Livestock raising on early American farms.
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