2. 外语
  3. Migratory birds fly in formation to______. How do the researchers test predictions of where birds should position themselves in

Migratory birds fly in formation to______. How do the researchers test predictions of where birds should position themselves in

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问题 Migratory birds fly in formation to______.
How do the researchers test predictions of where birds should position themselves in their echelon to conserve energy?
选项 A、Using the energy conservation hypothesis to categorize the positions of birds.
B、Using fluid dynamics and energy wave configuration calculations.
C、Using photography to analyze various flock formations.
D、Using knowledge of birds’ visual axes, "blind spots" and field of vision.
答案B
解析
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