根据要求完成句子，每空填一词。

1. He is never here. (改为反义句)

    He is _____ here.

2. I like the novel by Smith. (把I改为Tony)

    Tony _____ the novel by Smith.

3. She does her homework at school. (改为否定句)

    She _____ _____ her homework at school.

下列有关基因的说法不正确的是[ ]

A．基因都是通过控制酶的合成控制生物性状   

B．基因是有遗传效应的DNA或RNA片段   

C．基因以一定的次序排列在染色体上   

D．基因是生物遗传的基本功能单位