单项选择题

A．The effects of noise on the quality of life.
B．The role of air traffic restrictions.
C．The production of quieter engines.
D．Tile economic aspects of noise reduction.
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单项选择题
A．They must arrange the meeting place well in advance.B．They can postpone fixing the place till last minute.C．They needn’t decide when and where to meet.D．They still have to work out detailed meeting plans.
A．They must arrange the meeting place well in advance.
B．They can postpone fixing the place till last minute.
C．They needn’t decide when and where to meet.
D．They still have to work out detailed meeting plans.
填空题
A surprising link between changes in the season and crime patterns implies that ______.
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