根据首字母,在横线填上适当的单词,使句子完整.What is the n( ) between one and three?

问题描述:

根据首字母,在横线填上适当的单词,使句子完整.
What is the n( ) between one and three?

n(umber)

单词全名为:number
填只用填 n后面的