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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单项选择题
On hearing the fire alarm, those in class should go to ______.
A．A Block
B．B Block
C．C Block
D．the Assembly Area
单项选择题
What should you do during the fire alarm
A．Make use of the lift.
B．Move along without noise.
C．Collect personal things.
D．Overtake others on the way.
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