单项选择题

Why were cars considered the problem in colonial towns

A．Carts scared the pigs away.
B．Carts injured a large number of people.
C．Carts often moved too slowly.
D．Carts broke down too easily.
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单项选择题
According to the conversation, what did colonial town's people do to clean their streets
A．They used carts for collecting garbage.
B．They used pigs to get rid of garbage.
C．They burnt the garbage.
D．They set up trash cans.
单项选择题
What does the man say is a drawback to the process of restoring books
A．It's very expensive.
B．It hasn't proven to be totally effective.
C．It can be damaging to some books.
D．It can't be used on books published before 1850.
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