军队所属医疗卫生机构发现地方就诊的传染病病人、病原携带者、疑似传染病病人时,应向()报告。
参考答案:所在地疾病预防控制机构
I have been living in the United States for twenty years, but seldom ___ so lonely as now. [ ]
A. have I felt
B. I had felt
C. I have felt
D. had I felt
简述一般迁移与具体迁移的定义。