写作指导伸要求本题要求写参寒短文,属于半开放作文(审题)内容话题贴近日常生活,要点有引导性时态短文应以一般现在时为主【佳作展台】Technology and LifeOver the last few decades, new technologies haveconstantly come into our life and had positive effectson our life. For example, facial recognition makes iteasy for security guards to check passengers identity inhotels, stations and airports(it作形式宾语,不定式短语是真正的宾语). Satellite navigation technologyguides us to the place where we want to go(定语从6). Mobile payment allows us to purchase thingswith a smart phone. A voice assistantprovideanswers to our questions and do what we ask(宾语从句)It is obvious that modern technology has made ourife more convenient and colorful(I作形式主语,that从句是真正的主语). Only by taking full advantageIt is obvious that modern technology has made ourlife more convenient and colorful(It作形式主语,that从句是真正的主语). Only by taking full advantageof technology can we become the master of the life("Only 状语"位于句首引起部分倒装)
4.D【解析】由a至c的轨迹弯曲情况可知受力方向指向图中虚线的下方,b点的速度v的方向如图所示,由a至c质点的速率逐渐减小,则质点受力方向与速度方向的夹角a大于90°,因为质点带负电荷,故电场强度的方向应与力F的方向相反,D正确
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