问题
多项选择题
左氧氟沙星具有哪些结构特征和作用特点（）
A.结构中具有一个手性碳原子
B.结构中含有吡啶并嘧啶羧酸
C.抗菌活性比氧氟沙星强两倍
D.水溶性比氧氟沙星大，易制成注射剂使用
E.是已上市的喹诺酮类药物中毒副作用最小的药物
答案
参考答案：A, C, D, E
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左氧氟沙星具有哪些结构特征和作用特点（）
A.结构中具有一个手性碳原子
B.结构中含有吡啶并嘧啶羧酸
C.抗菌活性比氧氟沙星强两倍
D.水溶性比氧氟沙星大，易制成注射剂使用
E.是已上市的喹诺酮类药物中毒副作用最小的药物
参考答案：A, C, D, E
I arrived at my mother's home for our Monday family dinner. The smells of food over from the kitchen. Mother was pulling out quilt (被子) after quilt from the boxes, showing their beauties. She was for a quilt show at the Wooden Church. When we began to fold and put them into the boxes, my attention was by something at the bottom of one box. I it out. “What is it?” I asked. “Oh?” Mom said, “that's Mama's quilt.” I the quilt. It looked a group of school children had it together: irregular designs, childish pictures, a crooked on the right. “Grandmother made this?” I said, . My grandmother was a at making quilts. This didn't certainly look like any of the quilts she had made. “Yes, right before she died. I brought it home last year and made some ,” she said. “I’m still working on it. See, this is I’ve done so far.” I looked at it more closely. She had made straight a crooked line. At the center of the quilt, she had stitched a piece of cloth those words: “My mother made many quilts. She didn't get all line . But I think this is beautiful. I want to see it finished. Her last quilt.” “Oh, this is so nice, mom,” I said. It to me that by completing my grandmother’s quilt, my mother was her own mother. I realized I held in my hands a family . It started with the loving hands of one woman, and continued with the loving hands of another, two generations.
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