甲图为典型的细胞核及其周围部分结构示意图；乙图为有丝分裂过程中…个细胞核中DNA含量变化曲线，则相关叙述正确的是（）
A.假设甲图代表的细胞处在细胞周期中，则甲图代表的细胞相当于乙图的cd区间
B.在细胞分裂周期中，既可消失又可重建的结构是甲圈中的4、5，其消失时间是乙图的de区间
C.在细胞分裂周期中，可重建与消失的结构应为3，其重建时间为O-b或f-h，其余时间消失
D.甲图所示结构不可能代表细菌，但细菌分裂过程中也会出现DNA复制
参考答案：D
解析：图家中的细胞核有核膜、核仁等结构，说明处于间期、前期，而cd段是有丝分裂中期，故A错；核膜、核仁在有丝分裂过程中周期性的消失和重建，消失的时期为前期，故BC错；细菌是原核生物，其分裂方式为二分裂，不可能出现有丝分裂，在二分裂过程中存在遗传物质的复制，故D正确。考点：本题主要考查有丝分裂过程，意在考查考生能理解所学知识的要点，把握知识间的内在联系，形成知识的网络结构的能力。
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| It was half an hour before midnight on December 24th last year. I was a ticket-counter supervisor (主管) for a major airline and was looking forward to the 1______ of my shift (轮班) at Stapleton International Airport in Denver. My wife was waiting up for me at home so that we could 2______ our gifts for Christmas. Just then, a very 3______ gentleman went up to me: He asked how he could get to Cheyenne, Wyoming. He had just arrived from Philadelphia and 4______ his connecting flight. I pointed him to the ground transportation area, where he could rent a 5______. And then I called ray wife to let her know I would be home 6______ About fifteen minutes later, the gentleman 7______ and informed me that all the buses were full and there were no cars 8______. I told him that he had to stay for a night ai the airport. Hearing that, he burst into 9______. I tried to make him calm down. He explained that his name was Tom, and that his only son was 10______ ill at home and was not expected to 11______ another year, He expected that this would likely be the 12______ Christmas with his son. I told Tom to 13______ his luggage and wait for me at the gate. I was driving to Cheyenne. I called my wife Kathy, telling her about it and not to wait up for me. I drove fast 14______ and we arrived in Cheyenne around 2:30 a.m. Kathy was still 15______ me when I got home in the early morning. We traded gifts and then our conversation 16______ Tom. For Kathy and me, there was no 17______ that driving Tom to Cheyenne was the 18______ choice. A couple of days later, I 19______ a Christmas card with a picture of Tom and his family. In it, Tom thanked me for the special 20______ lie had received that holiday season, but I knew the best gift was mine. | ||||
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