单项选择题

A．The population of elderly people.
B．Nuclear weapon.
C．Violence in crime.
D．Living standards.
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单项选择题
A．She is going to Finland.B．She has visitors next week.C．She has guests at her home.D．She has just visited him this week.
A．She is going to Finland.
B．She has visitors next week.
C．She has guests at her home.
D．She has just visited him this week.
单项选择题
A．Energy conservation.B．A new kind of transportation.C．Strip cities.D．Advantages of air transportation over rail roads.
A．Energy conservation.
B．A new kind of transportation.
C．Strip cities.
D．Advantages of air transportation over rail roads.
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