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．Less garbage.B．More garbage.C．More waterbirds.D．More swimmers.
A．Less garbage.
B．More garbage.
C．More waterbirds.
D．More swimmers.
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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