In some parts of the United States, farming is easy. But farming has always been difficult

In some parts of the United States, farming is easy. But farming has always been difficult in the northeastern corner of the country, which is called New England.
New England has many trees and thin, rocky soil. Anyone who has wanted to start a new farm there has had to work very hard. The first job has been cutting down trees. The next job has been digging stumps (树桩) of the trees out of the soil. Then the farmer has had the difficult job of removing stones from his land.
The work of removing stones never really ends, because every winter more stones appear. They e up through the thin soil from the rocks below. Farmers have to keep removing stones from the fields. Even today, farms which have been worked on for 200 years keep producing more stones.
That is why stone walls are used instead of fences around New England fields. The stone walls are not high: A man can easily climb over them. But they keep the farmer’s cows from joining his neighbour’s cows.
64.   New England is an area     .
in the northeastern part of Britain        
which has been newly discovered by the Englishmen
which lies between Australia and New Zealand
which lies in the northeastern part of the USA
65.   According to the 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 are not enough machines for farming66.   From this passage, we know the removing of stones     .
must be done again and again             
is usually done during the winter
is an interesting job children enjoy doing
was more difficult before machines were used
67.   In New England, stone walls are used to     .
keep dangerous beasts out
keep the farmer’s cows from wandering away
protect the farmers fields from thieves
provide fortable living conditions for the farmer’s family64-67 DCAB