full version prints the 2022 Zunyi City, Guizhou Province high school entrance examination mathematics test papers (with reference answers). 
4． Regarding χ, the solution set of the linear inequality of one variable χ-3≥0 is expressed as ( )
5 on the number axis . It is estimated that the value of the root number 21 is ( )
A. Between 2 and 3 B. Between 3 and 4 C. Between 4 and 5 D. Between 5 and 6
12. The temperature γ1 (unit: ℃) in Zunyi City on a certain day changes with time t (unit: h) as shown in the figure. Let γ2 represent the range of the temperature value from 0 to t (that is, the range of temperature from 0 to t The difference between the maximum value and the minimum value), then the function image of γ2 and t is roughly ( )
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