21: From the shore-line out to a distance which may be anywhere from a few miles to a few hundred miles run the gentle slopes of the continental shelf, geologically part of the continents. 从海岸线延伸到远处，有一个从数百英里的大陆架的缓坡跑道，从地质学观点来看，它属于大陆的一部分。
A: 错误
B: 正确
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