第四部分写作第一节短文改错(共10小题;每小题1分,满分10分Last summer vacation, I work in a printing shop. That was my first job and it was a good chance for me to gain experienees. SoI took them seriously. At A beginning, the boss let me in do the cleaning work, which made me feel losing. Because I have preparedto learn how to do the print work when others used the machine. i ally, when the boss taught me to use the machine, I learned veryLalerquickly. Though i did not get much salary, I felt so proud it: myself, because I enhanced not only my self-worth and ability

1.A分泌蛋白的形成及运输过程需要消耗能量,线粒体是提供能量的主要场所,A错误;细胞的细胞器膜和细胞膜都属于生物膜,主要由磷脂和蛋白质组成,都含有磷元素,核糖体中的RNA也含有磷,B正确;不相邻的两个细胞可以通过信息分子进行信息传递,如激素、神经递质等,C正确;哺乳动物造血干细胞分化为成熟红细胞的过程中,细胞器全部丢失,D正确。

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