If you want to use your Business Telecard International, you have to______. The underlined word "they" in the last sentence of

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问题 If you want to use your Business Telecard International, you have to______.
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

解析词语释意题。从文章第一段The sheep allow the birds to do so because they’move the cause of discomfort．So although they can live without each other，they do better together．可知，这里的“they”指的是鸟和羊。

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