The accidental effects obtained by candid photographers were soon being copied by artists such as the French painter Degas.
The word "accidental" in the passage is closest in meaning to
答案：B。解析：accidental 表示“意外的，偶然的”参考英文注释：An accidental event happens by chance or as the result of an accident, and is not intended. 所以选B unintentional 无意的。很多同学会选D，因为unusual表示“偶尔的”，但是“偶尔”不代表“偶然”，“偶尔”强调次数少，“偶然”强调突发性，所以D不选。
Each kiva had a fire pit and hole that was believed to lead to the underworld. The largest pueblos had five stories and more than 800 rooms.
The word "stories" is closest in meaning to which of following?