动物细胞与植物细胞的结构不同,导致了它们有丝分裂的不同,这是因为植物细胞[ ]
A.有叶绿体和细胞壁
B.有细胞壁和液泡
C.有细胞壁,无中心体
D.有叶绿体和液泡
答案:C
Lily would rather I _______ her at the airport yesterday, but I was then busy with a meeting.
A.would meet
B.met
C.had met
D.have met
前列腺增生症的临床表现有哪些
A.一般在50岁以后出现症状
B.排尿费力,尿流缓慢
C.夜尿增多,尿频,尿末滴沥
D.排尿困难甚者尿潴留
E.无痛性血尿