It _____ me two hours to get there by bus. [ ]
A. spent
B. took
C. used
D. paid
B
编码转录调节因子的抑癌基因是()
A.p15
B.p16
C.Rb
D.p21
E.PTEN
左心衰竭主要体征有
A.速脉
B.缓脉
C.水冲脉
D.不整脉
E.交替脉