下图是菜豆种子的结构和萌发过程示意图,下列说法中不正确是( ) A . 菜豆种子萌发需要一定的水分、适宜的温度和充足的空气 B . 图中①是种皮,对幼嫩的胚有保护作用 C . 菜豆种子萌发时,图中②发育形成⑧ D . 图中②③④组成胚 答案:DThe government has promised to the
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