第33题: [单项选择]Which of the following is wrong about Redwall limestone cliff A. It is one of the most spectacular features of the Grand Canyon. B. It is practically vertical. C. Its average height is 550 feet. D. It enjoys the same fame with the Washington Monument. 参考答案:D 答案解析:这是一道细节题,Redwall limestone cliff是定位点。有关的信息在文章的第五段中。通过文章第五段可以得知,[A]“它是the Grand Canyon最壮观的景色”;[B]“它实际上