B) birds prefer to sleep in pairs for the sake of security
C) even an imagined companion gives the bird a sense of security
D) a single pet bird enjoys seeing its own reflection in the mirror
14.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
15.By just the tip of the iceberg , Siegel suggests that .
A) half-brain sleep has something to do with icy weather
B) the mystery of half-brain sleep is close to being sleepers
C) most birds living in cold regions tend to be half sleepers
D) half-brain sleep is a phenomenon that could exist among other species
11.C 12.A 13.C 14.B 15.D
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