单项选择题
A.sea B.sweet C.week D.kid
Yosemite Falls is the highest one in both North America...
判断题Yosemite Falls is the highest one in both North America and South America.
Who is the first explorer traversing Grand Canyon?（）A.J...
单项选择题Who is the first explorer traversing Grand Canyon?（）
A.John Powell B.John Smith C.John Parker D.John Muir
Grand Canyon State refers to（）。A.UtahB.ColoradoC.New Me...
单项选择题Grand Canyon State refers to（）。
A.Utah B.Colorado C.New Mexico D.Arizona
