A：﹣2
B：0
C：+4
D：+6
小麦的叶肉细胞和人体的神经细胞都具有的结构有（ ）
①细胞壁 ②细胞膜 ③叶绿体 ④线粒体 ⑤细胞核 ⑥中央大液泡 ⑦细胞质．
The story of Lei Haiwei, the winner of The Poetry Conference(诗词大会), again proved that it's necessary not to ____.
