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Piersma and Gill suggest that bar-tailed godwits—long-billed shorebirds of the Eurasian and Alaskan tundra—rank among the most ______ of the long-range fliers, traveling 11,000 kilometers nonstop across the Pacific.
- A.unpredictable
- B.versatile
- C.erratic
- D.unflagging
- E.renowned
- F.indefatigable
D,F显示答案
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以上解析由 考满分老师提供。
