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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 com, 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 arc 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 beat 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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