细胞是生命活动的基本单位，其结构和功能高度统一．下列叙述不正确的是（　　）

A．卵细胞体积较大有利于和周围环境进行物质交换

B．叶肉细胞中含有许多叶绿体，有利于进行光合作用

C．红细胞没有细胞核，含有大量血红蛋白，有利于运输氧气

D．神经元有许多突起，有利于接收刺激产生并传导神经冲动

( )The meaning representation of words may change，becoming broader, narrower, or shifted．The word knight once meant “youth”，but was elevated in meaning in the age of chivalry；When Juliet tells Romeo，“I’m too fond.” She is not claiming she likes Romeo too much．She means “I am too foolish．”These are two examples of semantic broadening．