用二倍体植株花药离体培养获得单倍体植株,再经诱导培育出新品种,该过程不涉及( )
A:用秋水仙素处理萌发的种子
B:细胞分裂
C:染色体数目加倍
D:细胞分化
He is very stubborn and once he ____ ____ ____ ____ ____ to do something, nothing can change it.
太阳能量的来源是( )