The Midwestern States Region is a vast area of generally flat land that covers much of the center of the United States.
举一反三
- There are _____ states in the United States.
- The state which has the largest land area of all the states in the United States is ______. A: Texas. B: California. C: Alaska. D: Utah.
- The Missouri drainage area covers one-sixth of the entire United States.
- The Constitution of the United States of America is the Supreme law of the United States.
- Although the United States covers so much land and the land produces far more food than the present population needs, its people are by now almost entirely an urban society. Less than a tenth of the people are engaged in agriculture and forestry(林业), and _