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

This passage explains ______.

A．how to make a stone wall in New England
B．why there are so many stone walls in New England
C．which parts of New England first used stone walls
D．why the fields in New England are so thin and rocky