皮拉大沙丘（下图）位于大西洋畔的法国西南部波尔多市(0°34'E．44°50'N)．这里夏季炎热干燥，冬天温和多雨，它的东边是都郁葱葱的森林。皮拉沙丘以每年5米的速度持续向内陆推进。该地景观反映了自然地理环境的（    ）

    One morning, I met a customer (顾客) in my shop .He wanted to buy some new clothes. First, I gave him a pair of trousers. He put them on to try, then took them off and gave them back to me and said, “No, give me a coat instead.”

    I gave him a coat and told him, “This one is worth as much as the trousers.” To my surprise, he took the coat without saying a word and walked out of the shop with it .I ran quickly after him and said , “You haven't paid for that coat!”

    “But I gave you the trousers for the coat,” he said. “They are worth the same as the coat, aren't they?”

    “Yes,” I said “But you didn't pay for the trousers, either!”

    “Of course, I didn't!” answered the man. “I did not take them. I am not foolish! Nobody gives things back and then pays for them.”

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如图为一个几何体的三视图．