问题
单项选择题 A1/A2型题
根据群、型特异性抗原，志贺菌属的血清型分为（）
A.4群46型
B.4群28型
C.4群42型
D.4群38型
E.4群36型
答案
参考答案：A
解析：志贺菌属的O抗原具有群和型特异性，根据O抗原构造，可将志贺菌属分为4群46个血清型。
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根据群、型特异性抗原，志贺菌属的血清型分为（）
A.4群46型
B.4群28型
C.4群42型
D.4群38型
E.4群36型
参考答案：A
解析：志贺菌属的O抗原具有群和型特异性，根据O抗原构造，可将志贺菌属分为4群46个血清型。
Every night, my mother would come to my room, lean down and push my long hair out of the way, then kiss my forehead． I don't remember when it first started me --her hands pushing my hair that way. But it did make me annoyed, for they felt work - worn and against my young skin．Finally, one night, I shouted at her: “Don' t do that any more --your are too rough！” She didn’t say anything in ．But never again did my mother close out my day with that expression of her love． Time after time, with the years, my thoughts returned to that night．I'm not a little girl any more．Mom is in her mid - seventies, and those hands I thought to be so rough are still doing things for me and my Now, my own children are . Mom no longer has Dad. It was late on that Thanksgiving Eve, as I went to sleep in the bedroom of my youth, a familiar hand before stealing across my face to brush the from my forehead. Then a kiss, ever so touched my brow．In my , thousands of times, I the night my young voice complained. Mom's hand in my hand, I said how I was for that night. I thought she'd remember, as I did, Mom didn't know what I was talking about. She had forgotten — and —long ago. That night, I fell asleep with a new for my gentle mother and her caring hands. And the I had carried around for so long was nowhere to be found．
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