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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)
辅助性T细胞,辅助性T细胞再产生细胞因子作用于B细胞,B符合題意;浆细胞不能识别抗原,C不符合題意;抗体的作用有特异性,所以一种抗体不能作用于三种抗原,D不符合题意答案B
3.乙肝疫苗的接种需在一定时期内间隔注射三次,其目的是A.使机体积累更多数量的疫苗B使机体产生更多种类的淋巴细胞C.使机体产生更多数量的抗体和淋巴细胞D.使机体产生更强的非特异性免疫
解析注射乙肝疫苗后,可使机体产生特异性免疫,形成特定的淋巴细胞(记忆细胞)和抗体;如果有同样的抗原再次刺激机体,记忆细胞会迅速增殖分化,产生大量的浆细胞和记忆细胞,浆细胞进而产生抗体消灭抗原,这就是二次免疫反应接种乙肝疫苗之所以要间隔注射三次,目的就是激发机体二次免疫反应的机制,使机体产生更多数量的抗体和淋巴鈿胞,
答案C
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