给下列加粗的字注音。
(1)汲( )取
(2)缺乏( )
(3)根深蒂( )固
(4)孜孜( )不倦
(1)jí
(2)fá
(3)dì
(4)zī
Before testing this method on patients, Dr. Baker had tests for two years
on three hundred dogs.
A.found out
B.helped out
C.worked out
D.carried out
企业的价值