()是社会保障制度产生与发展的基础性影响因素
A、经济因素
B、政治因素
C、道德因素
D、社会因素
参考答案:A
Kate was so glad ______ she received a Christmas gift from his grandparents away in Thailand.[ ]
A. that
B. when
C. if
蛔虫病最常见的并发症是()
A.蛔虫性胰腺炎
B.蛔虫性阑尾炎
C.胆道蛔虫症
D.肠梗阻
E.肠穿孔