单选题
By "is just the tip of the iceberg" in the eighth paragraph, 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
【正确答案】
D
【答案解析】
[解析] 需根据最后一段进行推测。“对鸟类的研究或许能使人们以独特的视角了解睡眠。M. Siegel说，他认为鸟类的半睡眠‘只是冰山浮出水面的那一角’，并推断当我们更深入地研究其他物种时还会发现更多类似的例子。”故D项为正确答案。
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