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】______ .
【B5】

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答案grassland

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