A:You could ask that man in red.
B:You shouldn't walk alone
C:You must stay with me
D:You needn't call your friend
图示是植物细胞新细胞壁的形成,据图分析下列有关叙述中正确的是( )
化学中有多种“守恒”.下面描述中对各种守恒的“解释”错误的是( )
23100
____ ____