下列对种子萌发过程中发生的变化，描述正确的是[ ]

A．种子萌发过程中有机物的种类增加，总量减少

B．在相同条件下，花生种子萌发时的需氧量比玉米少

C．小麦种子萌发时所需的营养物质由子叶提供

D．种子萌发时的吸水方式是渗透吸水

The children didn't go to bed _____ their mother came back. [ ]

A. but

B. until

C. and

D. because