单项选择题

Questions 19 to 22 are based on the conversation you have just heard.

A．They lived in caves.
B．They didn’t have their language.
C．They could only build houses with animal bones and skins.
D．They were advanced beyond our expectation.
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单项选择题
A．The problems of environment pollution.B．A material which can save fuel.C．The installation of pollution filters.D．The way to spray a coat on the engines.
A．The problems of environment pollution.
B．A material which can save fuel.
C．The installation of pollution filters.
D．The way to spray a coat on the engines.
单项选择题
A．After the invasion of the three tribes.B．After the invasion of the Vikings.C．After the invasion in 1066.D．After Christianity became the religion of Britain.
A．After the invasion of the three tribes.
B．After the invasion of the Vikings.
C．After the invasion in 1066.
D．After Christianity became the religion of Britain.
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