单项选择题

We can learn from the passage that the two talk shows _________.

A．have monopolized the talk show circuit
B．appear at different times of the day
C．exploit the weaknesses in human nature
D．are targeted at different audiences

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热门试题

单项选择题

A new study on birds' sleep has revealed that _________.

A．half-brain sleep is found in a wide variety of birds
B．half-brain sleep is characterized by slow brain waves
C．birds can control their half-brain sleep consciously
D．birds seldom sleep with the whole of their brain at rest

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