【单选题】Standing on the rim of the Grand Canyon, gazing across this giant wound in the Earth's surface, a visitor might assume that the canyon had been caused by some ancient convulsion. In fact the events th...
【简答题】听力原文: There are many who call the Sycamore Canyon a Little Grand Canyon, / which is an injustice to the Sycamore. / The Sycamore is subtle, / hiding its walls behind bushes and disguising its torturou...