Teachers have to constantly update their knowledge in order to maintain their professional ______.

【正确答案】 C

【答案解析】 考查名词辨析。句意为“教师要不断地更新他们的知识以便保持其专业能力”。consequence后果，结果；independence独立；competence能力，胜任，称职；intelligence智力，智慧，理解力。根据句意，故本题选C。