单项选择题

What particular advantage does Professor Thring's coal miner have

A．It does not have to go deep underground.
B．It can work in very narrow spaces.
C．It can work in the open air.
D．It is twice as strong as a human miner.

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单项选择题

Why does Professor Thring think that the unions should be pleased about the mechanical coal miner

A．Because a lot more miners will be needed.
B．Because miners will earn over 10,000 a year.
C．Because miners will not have to work underground any more.
D．Because it will reduce the risk of explosions.

单项选择题

What is Professor Thring's invention

A．A kind of machine which miners ride on.
B．A machine to supply fresh air to tunnels.
C．A digging machine operated at a distance.
D．A form of metal protective clothing.