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    Walt Whitman was a famous American poet (诗人). He was born 1 Mary 31, 1819, in Long Island. There were nine2 in his family, and he was the second. 3 he was four years old, his family moved to Brooklyn because his family was too poor. His childhood was restless (不安宁的) and unhappy. 4 the age of 11, he left school. Then he began to 5 a job to help his family. As a young man, Whitman 6 a school teacher, a printer and a newspaper reporter. He was 7 years old when he published his first book of poetry (诗集) in 1855. He 8 itLeaves of Grass. It 9 only twelve poems. The new form of his poetry 10 many people. Whitman was poor and weak during the last years of his life. He died in 1892.

有一个驰名中外的旅游胜地。傣族、哈尼族、布朗族等13个少数民族在这里和睦相处，创造并保留了各自别具特色的民族文化。傣族造型优美的佛教建筑群、江边湖畔小巧别致的竹楼、美味可口的菠萝饭和竹筒饭、富有民族特色的孔雀舞和象脚鼓舞、规模宏大的泼水节……以傣族为主体的多样性民族风情为该旅游区增添了无穷魅力。阅读材料回答题。

已知函数$f\left(x\right)=\frac{1}{3}{x}^3+ax+2bx+c$有两个极值点x₁，x₂且x₁，x₂满足﹣1＜x₁＜1＜x₂＜2，则直线bx﹣（a﹣1）y+3=0的斜率的取值范围是（　　）