稻田中，水稻和杂草的关系属于[ ]
A．捕食关系
B．互助关系
C．竞争关系
D．分工关系
答案：C
My uncle is not rich, but he has many books in ______ room. [ ]
A. he
B. his
C. him
试论社会保障的资金来源与筹资模式。
