磁体周围的磁感线都是从磁体的_________极出来，回到磁体的_________极（选填“N”、“S”）．
N；S．
赵乐的爷爷将一株单色的野生菊花培育成多个颜色、多个花朵的“塔菊”，他利用的方法是[ ]
A．嫁接
B．压条
C．扦插
D．种子繁殖
—The actor donated a lot of money. a generous man he is!
— .
A．What; So is he
B．What; So he is
C．How; So is he
D．How; So he is
