第16题: [单项选择]Labor force is composed of ______. A. people who are available to work and earn income B. self-employed people only C. only those who are looking for an employment D. only the employees 参考答案:A 答案解析:解析:由文中首句对labor force的定义可知答案。
第17题: [单项选择]扩大牙弓,推磨牙向后,减径或减数 A. 毛氏Ⅳ1分类错牙合 B. 毛氏Ⅱ4分类错牙合 C. 毛氏Ⅱ1分类错牙合 D. 毛氏Ⅲ2分类错牙合 E. 毛氏Ⅰ1分类错牙合 参考答案:E