语法与词汇 76.Many argue that efforts like this will______the line between the North and the South.

【正确答案】 A

【答案解析】考查动词辨义。blur“使…模糊不清”；enforce“实施，执行”；separate“分离”；extend“延伸，延长”。宾语是界限(the line)，故选A。