单项选择题

A．The environmental problem.
B．Tile health problem.
C．The educational problem.
D．The international problem.
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单项选择题
A．Because people have more free time to spend than before.B．Because people meet more problems than their parents.C．Because people have more, choices from How to hooks than any other books.D．Because modern life is more difficult to deal with.
A．Because people have more free time to spend than before.
B．Because people meet more problems than their parents.
C．Because people have more, choices from How to hooks than any other books.
D．Because modern life is more difficult to deal with.
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