The safety board found that the country has 35,000 miles of oil, natural gas and liquid pipelines, many of which are decades old and need immediate maintenance.
Avirtuous
Bhazardous正確答案
Cprestigious
Dindecent
答案與詳解
hazardous 意為「危險的、有害的」,老舊管線運送油氣液體易洩漏、爆炸,符合 safety board 關注的脈絡。
