—He's friendly and helpful.
A:What's he like?
B:How's he?
C:What's he?
D:What does he like?
It's ____ ____ ____ to do it.
芝麻和种子富含脂肪,小麦的种子富含淀粉,大豆的种子富含蛋白质,这些有机物都来源于( )