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.

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热门试题

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

单项选择题

Professor Thring expects that the Coal Board will ______.

A．reject his idea
B．listen to the Press
C．be unable to develop his invention
D．reduce coal output