单项选择题

A．The announcer should try to sound nervous.
B．The woman should get on the plane.
C．The plane will land at nine-thirty.
D．The woman should not worry.
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单项选择题
The smart buildings discussed in the passage ______.
A．would cause serious financial problems
B．would be worthwhile though costly
C．would increase the complexity of architectural design
D．can reduce the ground vibrations caused by earthquake
单项选择题
A．recursB．occursC．incursD．arises
A．recurs
B．occurs
C．incurs
D．arises
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