下列关于一株番茄和一头牛的叙述中，不正确的是 [ ]

A．细胞既是它们的结构单位，又是它们的功能单位

B．它们都是由受精卵发育来的

C．番茄果实的表皮和牛的心脏都是器官

D．它们各种组织的形成都是细胞分化的结果

Ten years ago the population of our village was _______ that of theirs.

A．as twice large as

B．twice as large as

C．twice as much as

D．as twice much as