单项选择题

Questions 23 to 25 are based on the conversation you have just heard.

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.
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单项选择题
A．They lived in caves.B．They faced their homes towards the south.C．They used animal skins as insulation.D．They made fire inside their houses.
A．They lived in caves.
B．They faced their homes towards the south.
C．They used animal skins as insulation.
D．They made fire inside their houses.
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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