Some birds like to sit on a sheep because ______. The underlined word "they" in the last sentence of the first paragraph refers

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问题 Some birds like to sit on a sheep because ______.
The underlined word "they" in the last sentence of the first paragraph refers to

选项 A、birds and parasites
B、birds and sheep
C、parasites and sheep
D、sheep, birds and parasites

答案B

解析 从文章第一段得知羊和鸟在一起时各得其所。
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