我想，学校离家有二十多公里，公路有不少地段已经被洪水冲毁，公共汽车已经停开。
B-Person O O B-Organization I-Organization O B-Location O B-Metric I-Metric I-Metric I-Metric I-Metric O B-Thing I-Thing O O O B-Location I-Location O O O B-Thing I-Thing O O O B-Thing I-Thing I-Thing I-Thing O O O O O