单项选择题

This is a subject that has now moved into the political domain.

A．extent
B．zone
C．area
D．competition
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单项选择题
No fasteners will be used in building A3XX because all components will be welded together.
A． Right
B． Wrong
C． Not mentioned
单项选择题
The basic model of A3XX can carry more than 500 passengers.
A． Right
B． Wrong
C． Not mentioned
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