2021-2022 英语周报 七年级 课标 20答案

11.A解析:图中甲是B细胞,乙是浆细胞,丙是记忆B细胞,物质①是抗体,图中②是身份标签—抗原识别受体,A正确;①是抗体,属于分泌蛋白,分泌蛋白合成与分泌过程为:核糖体合成蛋白质→内质网进行粗加工→内质网“出芽”形成囊泡→高尔基体进行再加工形成成熟的蛋白质→高尔基体“出芽”形成囊泡→细胞膜,整个过程还需要线粒体提供能量B错误;乙是浆细胞,丙是记忆B细胞,丙可以在抗原消失后很长时间内保持对这种抗原的记忆,当再接触这种抗原时,能迅速增殖、分化形成浆细胞,快速产生大量的抗体,参与二次免疫,C错误;人体免疫的第三道防线主要是由免疫器官和免疫细胞借助血液循环和淋巴循环而组成的,甲为B细胞,吞噬细胞不属于淋巴细胞,B细胞和吞噬细胞都属于免疫细胞、二者参与特异性免疫,D错误

书面表达One possible versionDear PeterI'm writing to invite you to see the Chinese Painting Exhibition to be held in our city.The exhibition will start at 8: 30 am on Saturday and last till 5: 00 pm on Sunday in the city museum It'ssaid that a large number of Chinese paintings, some of which are original works by famous painters like ZhangDaqian and Qi Baishi, will be on display. Besides, there will be various souvenirs to be sold. I know you re veryinterested in traditional Chinese culture, so I can t wait to tell you the news and hope we can go together.Looking forward to your reply.You

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