A. It is in the Great Lakes region. B. It is about 500 to 600 feet high. C. It is in the border area of the United States of America. D. Both A and C 参考答案:D 答案解析:[分析] 判断推理题。根据第一段的前两句话,可知Niagara Falls位于五大湖区;另外熟悉美国地理的人会知道五大湖区位于美国和加拿大交界地区,故D为答案。同时,根据第五段第二句话...John