单项选择题

According to the author, the importance of green-spaces in the urban environment ______.

A．is still unknown
B．is usually neglected
C．is being closely studied
D．has been full recognized
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单项选择题
The first paragraph is mainly about ______.
A．teenagers' criticism of their parents
B．misunderstandings between teenagers and their parents
C．the dominance of the parents over their children
D．the teenagers' ability to deal with crises
单项选择题
Teenagers do not want their parents to approve of whatever they do because they ______.
A．have already been accepted into the adult world
B．feel that they are superior in a small way to the adults
C．are not likely to win over the adults
D．have a desire to be independent
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