单项选择题

A．Because it is a personal and economic problem as well as a social one.
B．Because it is a totally personal problem.
C．Because it is a huge burden on economics.
D．Because it is social problem.
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单项选择题
A．They visit a recycling center.B．They clean a neighborhood park.C．They collect trash.D．They collect newspapers.
A．They visit a recycling center.
B．They clean a neighborhood park.
C．They collect trash.
D．They collect newspapers.
单项选择题
A．The woman might have made a mistake.B．The woman should go to Washington to listen to the singer.C．He thinks the singer is visiting the downtown area.D．He shares the woman’s idea.
A．The woman might have made a mistake.
B．The woman should go to Washington to listen to the singer.
C．He thinks the singer is visiting the downtown area.
D．He shares the woman’s idea.
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