多项选择题
What are the two reasons to shape the Grand Canyon?（）
A.seismic upheaval B.earthquake C.glaciation D.grits in Colorado river
判断题 UNESCO designated Redwood National Park a world heritage site because of its rare ecosystem and cultural history.
单项选择题 How deep is the Grand Canyon?（）
单项选择题 Conjure up means（）。
