问题
选择题
_________ is a famous waterfall in Canada.[ ]
A. Huangguoshu Falls
B. Detian Falls
C. Colorado Falls
D. Niagara Falls
答案
答案：D
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_________ is a famous waterfall in Canada.[ ]
A. Huangguoshu Falls
B. Detian Falls
C. Colorado Falls
D. Niagara Falls
答案：D