Migratory birds fly in formation to______. What makes sustained observation of flock formations very difficult?

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问题 Migratory birds fly in formation to______.
What makes sustained observation of flock formations very difficult?

选项 A、The characteristics of echelon changes.
B、Lack in hands and equipment.
C、Too many intuitive predictions.
D、Too many factors involved in echelons.

答案B

解析

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公共英语（PETS）

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Migratory birds fly in formation to______. What makes sustained observation of flock formations very difficult?

公共英语五级笔试

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