unknown [求助]几道弱弱的语法题

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Canadian scarlet-clad guards and mounties with horseback are part of the summer scene in ottawa

Allan Pinkerton, founder of the famous detective agency that bears him name , directed a cival war espinoage system behind confederate lines

The diamond is the hardest   substance  in the nature

___________,   , work songs often exhibit the song culture of a people in a fundamental form.

A They occur where they are

B Occuring where

C Where they occur

D Where do they occur

答案; b c d c

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mounties 与on  horseback 有什么关系呢

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以下是引用govinda在2004-8-8 16:38:00的发言：
mounties是mountie的缩写啦！！你查查字典就知道了~~呵呵。你肯定以为是mountain了

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偶好象记得nature 前面是要加the的啊

还是这里不作在自然界里理解