单项选择题

According to the study, men and women in the middle weight ranges ______.

A．are in a majority
B．have weight to height ratios below the national average
C．have the best life expectancy
D．the shortest life expectancy
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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
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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