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 参考答案:A 答案解析:[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 par
第25题: [单项选择]He set up in business ______ his own and was very successful. A. in B. of C. on D. by 参考答案:C 答案解析:[解析] 考查固定搭配。on one's own(=by oneself)意为“独自”，符合句意要求。in和by都不与one's own构成搭配；of one's own表示“某人自己的(东西)”，如
