英语周报2020–2021高二外研6期答案

18.(15分)2s21个个(1分)(2)N>O>C>B(1分)同周期元素第一电离能从左至右总趋势逐渐增大,但第VA族元素的p能级为半充满结构,第一电离能比第ⅥA族元素的大(2分,其他合理答案也给分)(3)sp2(2分)N(2分)(4)H3BNH3(1分)H3BNH3分子和水分子之间能形成氢键(2分)(5)①4(2分)②xy12×100(2分)〖解析】(1)基态O原子的价电子排布图为个个°(2)同周期元素第一电离能从左至右总趋势逐渐增大,但第VA族元素的p能级为半充满结构,第一电离能比第ⅥA族元素的大,故第一电离能:N>O>C>B(3)B3N3H6中存在大x键,该分子中N、B原子均为sp2杂化,B原子的价电子全部用来形成a键,大π键中的电子由N原子提供。(4)H3BNH3分子和水分子之间能形成氢键,易溶于水,而CH3CH3难溶于水。(5)①根据晶胞结构图知,以最中心Ca 为例,Ca2 周围距离最近且等距离的C-分布在这个Ca2 同一层的正方形的棱边的中点上,由于晶胞沿一个方向拉长,故上底面面心上和下底面面心上的两个〔与Ca2 的距离大于同一层上的4个与Ca2 的距离,故1个Ca2 周围距离最近且等距离的C有4个。②根据均摊法可知,1个晶胞的质量为464g,由晶胞中距离最近的两个C间的距离为apm,距离次近的Ca2和C2间的距离为bpm可知,晶胞体积为2a2×2b×10-30cm3,故晶体密度为64×a2×1030g·cm-3

第二节书面表达【写作思路】根据试题要求,考生需要写一篇记叙文,记述身边一位值得尊敬和爱戴的人。首先考生需要介绍自己最尊敬和爱戴的人是谁,简单地介绍一下他(她)。然后,陈述为什么他(她)值得尊敬和爱戴。最后,可以对前文进行一个总结,使文章结构严谨。本文的写作重点在"尊敬和爱戴的原因",考生可围绕这个要点适当拓展,从性格特点、处事风格等方面展开写作。【范文赏读】The most beloved and respected person around me is my teacher, Ms LiThough she has been teaching English for twenty years, she is still passionateabout teaching. She is kind and considerate towards us just like our dear motherWe all respect her because she always tries new ways to make her classes livelyand interesting. Hardworking and knowledgeable, she is one of the best teachersin our school. When we have a problem, we will turn to her for help. She alwaystalks to us patiently and helps us to find a solution. In our eyes, she is not onlyour teacher, but also our best friend. Those are why she deserves our respect【亮点词句】亮点词汇: beloved, respected, be passionate about, be consideratetowards, turn to sb. for help, in one's eyes亮点句式:Why引导的表语从句( why she deserves our respect)

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