单项选择题

A．The workers on the underground platforms were replaced by machines.
B．It became the first completely automatic railway in the world.
C．A completely automatic line was added to its network.
D．Computers began controlling the trains on the line.
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单项选择题
A．Man knows where the society is going.B．People don’t welcome the rapid development of our modern society.C．The speaker is worried about the future of our modem society.D．Man can do nothing about the problem of pollution.
A．Man knows where the society is going.
B．People don’t welcome the rapid development of our modern society.
C．The speaker is worried about the future of our modem society.
D．Man can do nothing about the problem of pollution.
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What is the reason for the fact that messages are more credible than ads
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