单项选择题

A．To emphasize the hazards of wooden buildings.
B．To explain why certain building techniques were firstly applied in Chicago.
C．To warn against building skyscrapers close together.
D．To explain how Chicago’s early skyscrapers were destroyed.
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单项选择题
A．To prepare students for the next reading assignment.B．To provide background information for a class discussion.C．To review material from a previous lesson.D．To prepare for a quiz on chapter six.
A．To prepare students for the next reading assignment.
B．To provide background information for a class discussion.
C．To review material from a previous lesson.
D．To prepare for a quiz on chapter six.
单项选择题
A．After midnight. B．After she goes swimming. C．When she’s bored. D．When there is a good program on.
A．After midnight.
B．After she goes swimming.
C．When she’s bored.
D．When there is a good program on.
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