Controlling occurs ______.

A) on a continual basis throughout the project
B) at the end of each phase of the project life cycle to assess its success in meeting project objectives
C) at the end of each planning process
D) on a continual basis throughout the executing process and as needed in the other process

下列有关种子和果实的叙述，正确的（　　）

A．苹果食用部分由胚珠发育而成

B．花生的外壳由子房壁发育而成

C．西瓜籽由子房发育而成

D．玉米种子的胚乳由受精卵发育而成