疾病预防控制机构、医疗机构的实验室和从事病原微生物实验活动的单位应当符合国家规定的条件，防止传染病病原体的实验室感染和病原微生物的扩散。（）
参考答案：对
We were all____ about her safety when she didn't come back at the usual time. [ ]
A. concerning
B. concern
C. concerned
D. being concerned
我国医药教育最早兴起于
A．隋朝
B．唐朝
C．南北朝
D．宋朝
E．明清
