单项选择题

The author believes that the Twin towers ______.

A．were not well-designed
B．were well-designed
C．were good examples for engineers of our time
D．were out of consideration when we talk about engineering later

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单项选择题

The reason why religious leaders assumed the task as performers was ______.

A．to prevent serious mistakes in performing rites
B．to have the chance of putting masks and costumes on the stage
C．to separate audience and performers
D．to provide a proper site for performance

单项选择题

It can be inferred from the passage that the tone of the author is ______.

A．subjective.
B．objective
C．biased
D．indifferent