单项选择题

What is not the reason that may cause the loss of heating

A．Rock music.
B．Air-raid siren.
C．Portable stereos.
D．A coffee-room conversation.
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单项选择题
Though labour worries about the effects of automation, it never doubts that automation _______.
A．will eventually prevent unemployment
B．will help workers acquire new kills
C．will eventually benefit the workers no less than the employers
D．is a trend which cannot be stopped
单项选择题
Which of the following can best sum up the passage
A．Advantages and disadvantages of automation
B．Labor and the effects of automation.
C．Unemployment benefit plans and automation.
D．Social benefits of automation.
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