第35题: [单项选择]All ______ is a continuous supply of the basic necessities of life. A. what is needed B. for our needs C. the thing needed D. that is needed 参考答案:D 答案解析:根据句子结构,我们可以看出,题目中句子结构完整,可以填入的只能是起修饰或辅助作用的成份,如定语或状语,D为正确答案,that is needed 在这里作定语,修饰先行词all。A错误,what不能引
A. they can eat its parasites B. they enjoy travelling 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]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