He was too tired. He didn't want to do .
A:something
B:anything
C:nothing
D:everything
回答下列问题:
①、种皮 ____ A、储藏营养
②、胚乳 ____ B、保护胚
③、胚 ____ C、能发育成植株
④、胚根 ____ D、发育成茎和叶
⑤、胚芽 ____ E、发育成根