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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