A. The Voyage Back B. An Arctic Summer C. Feeding Habits D. At the Breeding Grounds E. The Move South F. Mating *

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问题 A. The Voyage Back
B. An Arctic Summer
C. Feeding Habits
D. At the Breeding Grounds
E. The Move South
F. Mating
*

选项

答案D

解析句意：一个交配群由两头雄鲸和一头雌鲸组成。类似表述见第四段第三句。

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