The little girl is not to take care of herself. So her mother looks after her.
A:young enough
B:old enough
C:big enough
下列营养物质中,既不参与构成人体细胞,也不提供能量,而且人体的需要量也很小,但它对人体的作用却很大.该物质是( )
A: Would you mind repairing the MP3 player for me?
B: ______.