Pigeons have been used as messengers because . In the fifth paragraph, the underlined word "it" refers to .

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问题 Pigeons have been used as messengers because ______.
In the fifth paragraph, the underlined word "it" refers to ______.

选项 A、the earth’s magnetic field
B、the sun
C、the built-in compass
D、the special way

答案B

解析第五段中，鸽子利用太阳来定方位，所以“it”指太阳。故本题答案为B。

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