单项选择题

According to this passage, farming is difficult in New England because ______.

A．the winter is very long there
B．the farms are very old
C．the soil is rocky and thin
D．there is not enough machinery for farming
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单项选择题
In New England, stone walls are used ______.
A．to keep dangerous beasts out
B．to keep the farmer's cows from wandering away
C．to protect the farmer's fields from thieves
D．to provide comfortable living conditions for the farmer's family
单项选择题
It was suggested that the agreement ______ before the end of the year.
A．be signed
B．was signed
C．would be signed
D．had been signed
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