单项选择题

（） should involve in the campaign to deal with the substance abuse among youth.

A．Schools
B．Local, state and national government
C．Family and community
D．All of the above

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单项选择题
30（）

A．in
B．on
C．of
D．from
单项选择题
Food packages, bottles and tins for drinks can cause （）

A．air pllution
B．both the litter problem and waste of resources
C．excess consumption
D．unnecessary buying
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