单项选择题

The underlined word "exasperating"(Para2) most probably means

A．doing better
B．making frustrated
C．irritating very much
D．pacifying
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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．halt-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
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