语法与词汇 24."This park has more than 200 waterfalls that are 15 feet or higher. And 150 of them have never been mapped or photographed," says park historian Lee Whittlesey. "Now that's a______to the size of Yellowstone. "
【正确答案】 A
【答案解析】本题是说还有150处瀑布没有被测绘或拍摄，现已向公园提出了这建议。A项“proposition建议，主张”符合题意。其他三项“hypothesis假设；ceremony仪式；testimony证词，证据”都不正确。