问题
选择题
Teachers have to constantly update their knowledge in order to maintain their professional(专业的)_______.
A．consequence
B．independence
C．competence
D．intelligence
答案
C
考查名词的辨义。句意为“教师要不断地更新他们的知识以便保持专业上的称职。”consequence后果，结果；independence独立；competence能力，胜任，称职；intelligence智力, 智慧; 理解力。根据句意选C。