Migratory birds fly in formation to______. Why do echelon leaders change sometimes?

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问题 Migratory birds fly in formation to______.
Why do echelon leaders change sometimes?

选项 A、It can help optimize orientation.
B、Birds can better avoid collision.
C、The reason is still unclear.
D、Birds can’t determine one leader.

答案C

解析

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公共英语五级笔试

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