劳动合同审查是指劳动行政主管部门审查、证明劳动合同真实性、合法性的一项行政监督措施。在我国主要是指（）。
参考答案：劳动鉴证制度
If his parents are convinced ______ the fact that his son always focuses his mind _______his study.
A．of; on
B．of; at
C．by; to
D．on; at
一位绘画大师因深爱青城山风光，于1938年举家寓居上清文武殿，并自号“青城客”此人是谁？
