世界上能开花的植物成千上万,那么你知道最小的开花植物是什么吗?
参考答案:最小的开花植物是浮萍
急性阑尾炎最严重的并发症是()
A.阑尾穿孔腹膜炎
B.门静脉炎
C.膈下脓肿
D.盆腔脓肿
E.肠间脓肿
— How long have your parents _____?
— For 20 years. [ ]
A. got married
B. married
C. been married