卵泡刺激素和黄体生成素的分泌部位是（）

A.黄体

B.卵巢

C.卵泡

D.垂体

E.下丘脑

All known techniques for handling complex problems successfully seem to fall into one of the three classes: subdividing the problem (51) , ignoring irrelevant detail in a safe way (52) , and having an independent agent (53) the internal consistency (contextual checking). The first two provide guidelines for solving the problem, the third serves to provide early warnings. A good programming language supports all three.

In subdividing problem, some of the subproblems may be similar to the (54) problem. It leads us to a (55) solution. This (55) solution is viable provided each of the subproblems is easier to solve than the original problem.

（54）是（）

A.check

B.original

C.perform

D.recursive