如图为植物细胞分裂过程中不同时期的图象,按发生的先后顺序,排列正确的是( )
A:a→d→b→c
B:a→b→d→c
C:c→d→a→b
D:a→c→d→b
属于我国内流河是( )
ZhouYang can't thank her parents ______much because without their help she _____have won the first place in the Winter Olympic Games.