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
As we know from the 3rd paragraph, many people believe that ______.
A．the attack was led by Bin Laden
B．those who directed the attack was better engineers than those who built the towers
C．those who directed the attack know quite a lot about the towers
D．the attack was made spontaneously
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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