单项选择题

The part of the building below 90th floor ______.

A．remained where they were
B．cracked down because of the burning
C．was hammered down by the falling upper part
D．was safe after the attack
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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
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
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