单选题：根据听到的内容，回答题How does a whale keep itself warm?[ A ] By its th

题目内容：

根据听到的内容，回答题
How does a whale keep itself warm?
[ A ] By its thick layer of fat under its skin.
[ B ] By moving frequently in the water.　　
[ C ] By adjusting its blood temperature.
[ D ] By taking in hot air.
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