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  3. 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 fi

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 fi

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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】______ .
【B11】
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答案This small mammal lives in a series of underground passages
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