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

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

admin2009-06-24  66
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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