If you want to use your Business Telecard International, you have to______. Some birds like to sit on a sheep because______.

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问题 If you want to use your Business Telecard International, you have to______.
Some birds like to sit on a sheep because______.

选项 A、they can eat its parasites
B、they enjoy traveling with the sheep
C、they depend on the sheep for existence
D、they find the position most comfortable

答案A

解析 事实细节题。从文章第一段第四句,This is not because they want a ride,but because they find easy food in the parasites on sheep可知,它们想吃羊背上的寄生虫。所以正确的答案为A。
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