某地区一日的气温如下,8点测得3℃,14点测得9℃,20点测得1℃,2点测﹣1℃,该地区这一天的日平均气温为( )
A:3℃
B:2℃
C:4℃
D:0℃
阅读下图
When How much Which How often
Who Whose What day Where