下列哪些综合治理措施可以使洞庭湖“变大”( )
A:封山育林
B:退田还湖
C:加固干堤
D:跨流域调水
染色体部分缺失在育种方面也有重要作用,下图是育种专家对棉花品种的培育过程,相关叙述错误的是( )
——Congratulations to you on making such great progress!——Thanks, but I would do better ________ I was given more time.