单项选择题

The main theme of the passage is ______ in the G-7 nations.

A．wealth
B．aging
C．death rates
D．work force

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involvement

单项选择题

A．To intimidate intruders on their territory.B．To keep social order and ease social tension.C．To warn others in the group of dangers.D．To show intimacy.

A．To intimidate intruders on their territory.
B．To keep social order and ease social tension.
C．To warn others in the group of dangers.
D．To show intimacy.

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