2. 外语
  3. A new study on birds’ sleep has revealed that ______. By "is just the tip of the iceberg" in the eighth paragraph, Siegel sugge

A new study on birds’ sleep has revealed that ______. By "is just the tip of the iceberg" in the eighth paragraph, Siegel sugge

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问题 A new study on birds’ sleep has revealed that ______.
By "is just the tip of the iceberg" in the eighth paragraph, Siegel suggests that ______.
选项 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
答案D
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"。
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