【题目】With such an ecological variety, amazing natural beauty, and so much to do, it's _______ that the falls are a wonder.
A. no doubt B. no way C. no wonder D. no problem
在线课程【答案】C
【解析】
试题分析：A.no doubt毫无疑问 B.no way没门 C.no wonder难怪 D.no problem没问题 句意：随着生态变异的出现，奇异的自然美并且有很多可以坐的事情，难怪秋天就是一个奇迹。