Your father's brother is your______. [ ]
A. brother
B. grandfather
C. uncle
D. mother
答案:C
矿井发生火灾后如何灭火?
叶类生药的来源是()
A.单子叶植物的茎叶
B.双子叶植物的叶
C.裸子植物的带叶嫩枝
D.B和C
E.A和B