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.
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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.
单项选择题
A．The double room required by the man has been changed to a single one.B．The man wanted to call off his booking.C．The booked room has been occupied by someone else.D．The man wanted to change his booking.
A．The double room required by the man has been changed to a single one.
B．The man wanted to call off his booking.
C．The booked room has been occupied by someone else.
D．The man wanted to change his booking.
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