某公司为确定下一年度投入某种产品的宣传费,需了解年宣传费x(单位:千元)对年销售量y(单位:t)和年利润z(单位:千元)的影响.对近8年的年宣传费xi和年销售量yi(i=1,2,…,8)数据作了初步处理,得到下面的散点图及下面一些统计量的值.
46.6
563
6.8
289.8
1.6
1469
108.8
表中 , .
附:对于一组数据(u1,v1),(u2,v2),…,(un,vn),其回归直线v=α+βu的斜率和截距的最下二乘估计分别为 , .
写出反义词
足—____ 弃—____ 死—____
那汉去夺时,这客人手拿半瓢酒,望松林里便走。那汉赶将去。只见这边一个客人从松林里走将出来,手里拿一个瓢,便来桶里舀了一瓢酒。那汉看见,抢来劈手夺住,望桶里一倾,便盖了桶盖,将瓢望地下一丢,口里说道:“你这客人好不君子相!戴头识脸的,也这般罗唣!”
看图, 填写单词。
____
根据短文内容,选择正确答案。
Peter always doesn't know the way. His friends often laugh at him. They say he needs a map to find the bathroom in his own house. In his eyes, every street looks the same, and he doesn't know which way to go. Sometimes he has to take a taxi home because he can't remember the way to his house.
Peter watches a lot of films and reads a lot of books about animals. Each bird knows which way is south. Bats (蝙蝠) can fly at night and find their way with their ears. He feels embarrassed (困窘的) because all these animals have a good sense of direction. He tries to find his way with the help of stars in the sky. There is a star called the North Star, and he knows how to find it. Of course, Peter's friends are still laughing at him, because he can only see the North Star outside when it is sunny at night. He can't tell the directions in the daytime or when he is inside or when it is cloudy.