单项选择题

The word "ignition" (Line 5, Para. 1 ) means" ______".

A．fierce crash
B．causing to catch fire
C．failure of engine
D．extremely hot condition
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单项选择题
According to the article, those who designed the tower could have done better if ______.
A．the tower lasted longer after being attacked
B．the tower hold stable until all of the people there managed to escape
C．the tower can be immune to such attacks
D．they considered more about the effects of the very' high temperatures and make duel changes in the structure
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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