单项选择题

Who had gas-masks

A．Everybody.
B．A part of the protestors.
C．Policemen.
D．Both a and C.
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单项选择题
In the writer's view, ______.
A．people should be prepared for the future
B．there exists no threat of unemployment
C．unions can stop the unfavorable change
D．people had better become cleaners
单项选择题
According to the writer, the rate of change in technology ______.
A．will remain the same.
B．will slow down
C．will speed up
D．can not be predicted
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