单项选择题

What is the main topic of the conversation

A．The difficulty of raising animals on farms in colonial America.
B．Traffic problems in colonial American cities.
C．Population growth in colonial American cities.
D．Economic conditions in colonial Americ

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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.

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.