'This park has more than 200 waterfalls that are 5 feet or higher. And 50 of them have never been mapped or photographed,' says park historian Lee Whittlesey. 'Now that's a ______ to the size of Yellowstone.'
A.
proposition
B.
hypothesis
C.
ceremony
D.
testimony
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参考答案:
举一反三
【简答题】Please match the following pictures with the environmental problems