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14.解：本题考查远距离高压输电问题，着重考查学生知识应用能力。(1)发电机的输出功率P1=noghQ(2分)解得P1=1.0×105W。(1分)(2)升压变压器原线圈中的电流I1=(1分)可得I1=400A根据理想变压器的电流规律1(1分)m2可得升压变压器副线圈中的电流I2=25A输电线上损耗的电功率△P=I22r=5000W(2分)则P3=P4=P1一△P=9.5×104W(1分)所求家庭数n=P(1分)可得n=50。(1分)
请以”One person I’m grateful to”为题，用英语写一篇100—120个词的短文，记述一个你认为值得感谢的人。要求如下：
1. 内容必须结合生活中的一个事例;
2. 简要说明值得感谢的原因或从中得到的启示；
3. 文中不得透漏个人信息。
注意：文章的标题已给出（不计词数）。
One Person I’m Grateful to
试题答案
We are supposed to be grateful to people who are always there with us because they are the charming gardeners who make our souls blossom.
My English teacher is such a great soul, to whom I owe many thanks. During the previous study, my biggest flaw must come to carelessness, which worried me a lot. To make matters worse, I was too anxious to seek the fundamental reason for my failure. I just dedicated myself to huge amounts of practice, regardless of repeated mistakes. Fortunately, my teacher noticed it and offered to have a long talk with me. Having been persuaded to change my attitude, I finally got the right way to rid myself of carelessness and gained confidence as well.
I am grateful to my English teacher for all the support he has given me, which has made me stronger and a better person
【解析】
试题分析：这是一篇说明文写作，说明的对象是一个自己很感激的人。文章的主要内容提出中已经说明，记叙一个生活事例，说明感谢的原因和从中得到的启示。因此叙述的时间要内容真实，感情饱满真切。时态：用一般现在时。使用一些高级句型和词汇提升作文档次。【亮点说明】第一段第一句话We are supposed to be grateful to people who are always there with us使用who引导的定语从句；第二自然段第一句话My English teacher is such a great soul, to whom I owe many thanks.再次使用定语从句；第二句话my biggest flaw must come to carelessness, which worried me a lot.使用which引导的非限制性定语从句；最后自然段I am grateful to my English teacher for all the support he has given me, which has made me stronger and a better person使用which引导的非限制性定语从句。文章在短语运用上，灵活多变，To make matters worse使用动词不定式表示状语；regardless of repeated mistakes.介词短语表示状语；Having been persuaded to change my attitude使用现在分词短语表示状语；I was too anxious to seek the fundamental reason for my failure.，使用too．．．to．．．太．．．而不能．．．。I just dedicated myself to huge amounts of practice中，使用了dedicate myself to投身于．．．。在词汇运用上，选用一些高级词汇，提升文章的表达和魅力。第一自然段使用charming gardeners迷人的园丁，写出了教师职业的高尚，和老师灵魂的高尚，真实清晰地表达了作者对于老师的感激之情。make our souls blossom的表达分词生动，形象地说明了老师对我们心灵的培育，教导我们成长。
考点：考查说明文写作
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