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  3. New images of a weird weather phenomenon known as a roll cloud have surfaced in Richland, Mississippi. The images, taken by

New images of a weird weather phenomenon known as a roll cloud have surfaced in Richland, Mississippi. The images, taken by

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问题     New images of a weird weather phenomenon known as a roll cloud have surfaced in Richland, Mississippi.
    The images, taken by a phone camera by a Mississippi【B1】______Daniel Blake Fitzhugh, reveal a seemingly endless roll cloud, or arcus cloud, a low cloud【B2】______ that forms over the sea or at the edges of thunderstorms. Fitzhugh sent an image and video of the cloud to LiveScience after seeing an earlier report of a roll cloud off the coast of Brazil.
    Fitzhugh told LiveScience he【B3】______the video and image of a roll cloud in 2010 in Richland, a town on the【B4】______of Jackson, Mississippi.
    "It had been cloudy and windy all day," Fitzhugh wrote in an e-mail. "I was heading north and the cloud was going from west to east. I noticed it and was【B5】______surprised! I had never seen anything like it before."
    The cloud was rolling around like a "sideways tornado," Fitzhugh said. In fact, roll clouds form where sinking cold air drives low-hanging,【B6】______warm air upward, where cooler temperatures condense the moisture in the air to form clouds. Winds【B7】______the weird rolling effect. Their more commonly spotted cousins, shelf clouds, form on the leading edges of thunderstorms; while shelf clouds【B8】______the bulk of a storm, these tubular clouds aren’t.
    Tornadoes are also【B9】______storms when they occur. Unlike tornadoes, roll clouds aren’t dangerous.
    They are rare, however. One of the best chances to see a roll cloud is off the coast of Queensland, Australia. Here, sea winds【B10】______form a reoccurring roll cloud known as Morning Glory during the fall months.
【B4】
选项
答案outskirts
解析 句意推断题。根据空格前的on the和空格后的介词of可知，此处应填入名词。结合录音可知，答案为outskirts，意为“郊区”。
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