3.D【解析】本题考查线性回归方程,考查数据处理能力因为z=1 2 3 4 5=3,y2 3 5 7 85=5,所以5=3 0.2,解得b=1.6.
第四部分写作(共两节,满分35分)第一节短文改错(共10小题;每小题1分,满分10分)Have you ever looked around in a cafe and notice that everyone else has their eyes gluedto their smartphones? You're probable one of them Over 1.8 billion people own smart-phonesbut use their devices on a daily basis. Studies have found that a average person checks his or herphone about 150 time a day. This"addiction"on technology reaches even youngest membersof soDr Jenny Radesky noticed that smartphones took oKparents' attention away from ourchildren. She is worried that this could affect children emotional development. Thereforechildrenswe should pay enough attention to this phenomenon and make some changes
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