| | | | | | | | 1. | ① | | | | | | | D | | | | | | | ② | | | | | ③ | | | | | | ④ | | | | | | | | | | | 1/3 | | | | | | | | 2. | | | | | | | 50 ~ 75 3 ~ | 4 | | 3. | | | | | | | | | | | | | |