已知代数式0.5a的值为2，那么4a2﹣a+1值为[ ]
A．61
B．59
C．13
D．1
答案：A
An audience’s humorous words made us , so the lecturer couldn’t make himself .
A．laugh; hearing
B．laugh; heard
C．laughing; hear
D．laughed; to be heard
为什么要采用液芯矫直？
