Being a parent is not always easy, and being the parent of a child with special needs often carries with ______ extra stress.
 
【正确答案】 A
【答案解析】 句意为做一个家长是不容易的,做一个需要特别照顾孩子的家长就会有额外的压力了。这里要注意指代的是parent还是事物本身。分析后可知是事物本身,故本题选A。