Now we travel to the north central part of the United States. We are in the

游客2023-09-09  16

问题      Now we travel to the north central part of the United States. We are in the state of South Dakota. The land is big and mostly fiat with many【B1】______  of corn, wheat and soybeans. But as we travel west, the cropland gives way to wild grasses. A strong dry wind blows【B2】______ from the west.
     Suddenly, the land becomes【B3】______ and rocky, dry and dusty--no longer green and gold. It is now a light red-brown color. All around are broken【B4】______ forms. There are hills and valleys of all sizes and strange shapes.
     These are the Badlands. Hundreds of thousands of years ago the area was【B5】______ , but, then, forces of nature【B6】______ the grass. Water and ice cut into the surface of the earth. They heat at the rocks,【B7】______ them away. The result is one of the world’s【B8】______ sights.
   【B9】______  
    The area is a study in extremes. Temperatures in the summer have been as high as forty-six degrees Celsius.【B10】______  
    Life in the Badlands is difficult, but animals do survive. The most well known is the prairie dog.【B11】______ . [br] 【B6】

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