单项选择题

A．Homework.
B．Seminar presentation.
C．Health.
D．Class attendance.
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单项选择题
A．A worthless burden to big cities.B．Something that can be reused.C．A raw material for making new products.D．Something able to recycle but difficult to handle.
A．A worthless burden to big cities.
B．Something that can be reused.
C．A raw material for making new products.
D．Something able to recycle but difficult to handle.
单项选择题
A．inB．byC．withD．to
A．in
B．by
C．with
D．to
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