单项选择题

This passage says that the work of removing stones ______.

A．must be done again and again
B．is usually done during the winter
C．is an interesting job children enjoy doing
D．was more difficult before machines were used

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单项选择题

New England is an area ______.

A．in the United Kingdom of the Great Britain
B．which has been newly discovered by the Englishmen
C．which lies between Australia and New Zealand
D．which lies in the northeastern comer of the United States

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