被减数减少2.4,减数增加2.4,差不变。( )
—Yeah, she works hard and practices_________ it both in and out of class.
将下面左图与右面的繁殖方式匹配:①水稻 ____ A.嫁接②草莓 ____ B.分株③葡萄 ____ C.扦插④梨 ____ D.孢子
⑤海带 ____ E、种子