What can we know about the sand exhibit from the text?

参考解析：

细节理解题。根据第二段第五句“The sand from each year’s exhibition is used again the next year”及最后一段最后一句“Thai will be just about the time that the U. S. sand sculpture exhibition is taken apart, and the sand is saved for next year’s show”可知，每年的沙子可重复使用，故A项错误；根据第一段最后一句“Artists came from 19 countries to shape sand”可知，来自19个国家的艺术家，而不是19个国家举行，故B项错误；根据第四段第四、五句“Now many more tourists get to see the sculptures. Still, the fact that this art is not permanent is part of the appeal”可知，现在有更多的游客参观雕塑。尽管如此，这一艺术不是永久性的事实却是有吸引力的一个部分。其中的not permanent与last a short time是同义词，由此可判断C项错误。故选D。