Migratory birds fly in formation to. The word "each" in the 5th sentence of the second paragraph refers to.

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问题 Migratory birds fly in formation to______.
The word "each" in the 5th sentence of the second paragraph refers to______.

选项 A、formation.
B、study.
C、factor.
D、explanation.

答案D

解析

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公共英语五级笔试

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