单项选择题

61（）

A．blew
B．blowing
C．to blow
D．blown

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单项选择题
By just the tip of the iceberg (Para. 8), 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 solved
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
单项选择题
60（）

A．except
B．because of
C．beyond
D．for
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