问题
单项选择题
When the Erie Canal was built in the 1820's, it was the engineering marvel of its time.
A．wonder
B．dispute
C．frustration
D．model
答案
参考答案：A
解析：名词辨析。marvel奇迹；wonder奇迹，惊奇；dispute争论，辩论，争吵；frustration挫败，挫折，受挫；model样式，模范，典型；因此选项A为答案。