下列叙述正确的是（　　）

读图“中国山脉分布图”，完成下列各题

    Hi!My name's Ernie. I'm 13 years old and I go to a middle school.

    Here I want to talk about my classroom. It is small, but new and nice. There are big windows so there is a lot of light. There is a table for the teacher and 12 desks for the students. Two students share(合用)one desk. There is a blackboard on the wall. On the other walls there are some pictures of animals--elephants, bears and horses. There are also two maps here. One is a map of Great Britain and the other is a map of Europe(欧洲). There are four computers in my classroom. I sit in Row One and share a desk with Linda,She is my new classmate and my best friend, too.

根据材料内容选择最佳答案。   

科学家利用基因工程培育出了耐盐的转基因水稻新品系。下有关叙述错误的是

一个数减1就得最大的三位数，这个数是（   ）