单项选择题

A．Growth of violence on TV.
B．Destructive threat from nuclear explosives.
C．Degrading moral standards.
D．All of the above.
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单项选择题
A．At a restaurant.B．In a store specializing in seashells.C．On a fishing boat.D．In the fresh ocean air.
A．At a restaurant.
B．In a store specializing in seashells.
C．On a fishing boat.
D．In the fresh ocean air.
填空题
What does the author mainly discuss in this passage
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