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.

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热门试题

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.

单项选择题

Professor Thring's mechanical coal miner ______.

A．has already been seen by the Coal Board
B．is his first invention
C．looks like a TV camera
D．is not yet in production