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
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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
单项选择题
According to the passage, birds often half sleep because ______.
A．they have to watch out for possible attacks
B．their brain hemispheres take turns to rest
C．the two halves of their brain are differently structured
D．they have to constantly keep an eye on their companions
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