问题
选择题
Niagara Falls is a famous waterfall in _____. [ ]
A. the U.K.
B. the U.S.
C. Australia
D. Canada
答案
答案：D
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Niagara Falls is a famous waterfall in _____. [ ]
A. the U.K.
B. the U.S.
C. Australia
D. Canada
答案：D