2013高考英语二轮复习专题限时训练
专题限时训练(二十三) [史地自然型阅读理解(一)]
(限时：25分钟)
(一)
Wind，water，fire and ice—these powerful natural forces have shaped the land of America in the past. They are still changing it today.
The Colorado River slowly cut down through stone to make the Grand Canyon (大峡谷)．
Long ago，ice sheets cut Yosemite Valley and the Great Lakes，and glaciers (冰川) are still on the move in Alaska.
