英语周报七年级上册21期。答案

短文改错This evening my father was at a grocery store, where is often crowded. A woman next to with him hadwhiclocked her keys and her baby in her vehicle. Several store clerks had tried to help her but in vain, and he did notshehave the money for a tow truck(E4). My father called a friend of his who is the tow truck driver. It wasalate in the evening and he were having dinner with his family. Therefore, he immediately agreed a drive to helpwasHowevertothe woman. My father then gave the driver twenty dollars and all ended good. The woman was quite moving andwemovednearly burst into teartears

12.B〖解析】脂筏由糖脂、磷脂和胆固醇以及特殊蛋白质等组成,其合成与核糖体、高尔基体、内质网有关,但与中心体无关;脂筏中含有跨膜蛋白质,可能与细胞控制物质进出的功能有关;细胞凋亡是细胞核中的基因选择性表达的结果;与脂筏识别功能密切相关的成分应该是糖脂。故选B

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