单项选择题

A．low in education
B．low in income
C．either very young or very old
D．all the above
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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.
单项选择题
A．People seldom read newspapersB．People cannot read.C．People have eye problems.D．All the above
A．People seldom read newspapers
B．People cannot read.
C．People have eye problems.
D．All the above
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