单项选择题


A．changing
B．varying
C．moving
D．altering
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单项选择题
A．itsB．hisC．theirD．her
A．its
B．his
C．their
D．her
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
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