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
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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
单项选择题
While sleeping, some water mammals tend to keep half awake in order to ______.
A．alert themselves to the approaching enemy
B．emerge from water now and then to breathe
C．be sensitive to the ever-changing environment
D．avoid being swept away by rapid currents
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