单项选择题

A．Less garbage.
B．More garbage.
C．More waterbirds.
D．More swimmers.
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单项选择题
A．low in educationB．low in incomeC．either very young or very oldD．all the above
A．low in education
B．low in income
C．either very young or very old
D．all the above
单项选择题
A．The age of the tree.B．The changing activities of sun.C．A lot more.D．All the above.
A．The age of the tree.
B．The changing activities of sun.
C．A lot more.
D．All the above.
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