In object-oriented (51) , objects can be viewed as reusable components, and once the programmer has developed a (52) of these components, he can (53) the amount of new coding required. But (52) a (54) is no simple task because the integrity of the Original software design is critical. Reusability can be a mixed blessing for user, too, as a programmer has to be able to find the object he needs. But if (55) is your aim, reusability is worth the risk.

（51）是（）

A.complexity
B.creating
C.indisposing
D.library
E.maximize
F.minimize
G.reading
H.procedure
I.productivity
J.programming
K.security
L.using