单项选择题

Most of us spend our lives seeking the natural world. To this 1 , we go fishing, sit in the garden, drink outside rather than inside the pub, live in the 2 or go to the seaside. It is my profound belief that not only 3 we all need nature, but we all seek nature, 4 we know we are doing so or not.
But despite this, our children are growing up 5 . I spent my boyhood 6 trees on Streatham Common, South London. These days, children are robbed 7 these ancient freedoms, due to problems like crime, traffic and the loss of the open 8 .
A study in Sweden indicated that kindergarten children who could play in a natural environment had less 9 and greater physical ability than children used only 10 a normal playground. A U.S. study suggested that when a school gave children 11 to a natural environment, academic levels were raised across the entire school.
Another study found that children play 12 in a natural environment. In playgrounds, children create a hierarchy (等级) 13 on physical abilities, with the tough ones taking the 14 . But when a grassy area was planted with bushes, the children got much 15 into fantasy play, and the social hierarchy was now on 16 and creativity.
But children are frequently discouraged 17 involvement with natural spaces, for health and safety reasons, for 18 that they might get dirty or that they might cause damage. So, instead, the damage is 19 to the children themselves: not to their bodies but to their 20 .

A.woods
B.suburbs
C.slums
D.downtown
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