单项选择题

A．They need new materials made from garbage.
B．The garbage makes their environment more and more dirty.
C．Their traditional ways of dealing with wastes are not efficient.
D．They find some materials useful.
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单项选择题
A．At a news-stand.B．In the library.C．In the college bookstore.D．At a department store.
A．At a news-stand.
B．In the library.
C．In the college bookstore.
D．At a department store.
单项选择题
A．They can share it with others.B．They can save it.C．They can buy things they want.D．All-above mentioned.
A．They can share it with others.
B．They can save it.
C．They can buy things they want.
D．All-above mentioned.
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