问题
选择题
Teachers have to constantly update their knowledge in order to maintain their professional ______.
A．consequence
B．independence
C．competence
D．intelligence
答案
答案：C
名词辨析。A结果；B独立；C能力；D智力；结合句意可知C正确。句意：未了维持他们的专业能力，老师需要不停地更新他们的知识。