短文改错（共10小题，每小题1.5分，满分15分）

Do you know Mid-Autumn Festival? It’s one of the most      76. __________

important festival in China. It’s like Thanksgiving Day in   77. __________

America. It usually comes in September and October. This   78. __________

year it’s going to be in October 3.  On that day families   79. __________

get together for a big dinner and eat moon cakes. Moon cakes  80. __________

are delicious, some of that have eggs, nuts or something   81. __________

sweet inside and some has meat inside. Many families eat their  82. __________

dinner outside in the open air. The moon looks like brighter   83. __________

and rounder on this day. We could watch the moon, eat delicious  84. __________

moon cakes and listen the story of Chang’e. How happy   85. __________

we are!

某地区2002～2013年统计某种产品消费量(Y)及同期相关产业产值(X)得出如下数据：∑xi2=28.68∑yi=80.4，=8.94∑xi=16.2，=1.62∑xiyi=154.33，用一元线性回归模型的回归系数是()。

A、9.89

B、-7.55

C、3.44

D、-2.77