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结合禽流感叙述引起传染的必要条件。
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B Doing homework not only can help children master the knowledge they have learned, but aslo can train their abilities of doing the work alone, planning the time and doing the duties. But some children don’ t like to complete the work. Why There are some reasons. Some children feel it is very difficult to do their homework, because they can’ t understand their teacher clearly, and can not follow their teacher’ s teaching process (过程). Maybe there is something wrong with their intelligence. But some children’ s intelligence is normal. They are even cleverer, but they don’ t listen to the teacher carefully. It is hard for them to sit well and pay attention to anything. It needs to carry on the attention centralized(集中精力) training to help the children. Some children love their teacher and then they like the subject. Their interest depends on the teacher who teaches them. So every teacher should be helpful and kind. It can make children love you and the subject you teach. So they can do their homework happily. What is the best title of the passage（）
简答题 甲、乙签订了一份买卖合同，合同约定：甲将一批木板卖给乙，乙于收到货物后一定期限内付款。为了保证合同履行，经乙与甲、丙协商同意，甲又与丙签订了一份质押合同。质押合同约定，丙以其可转让商标专用权出质为乙担保（已向有关部门办理了出质登记），当乙不能履行合同义务时，由丙承担质押担保责任。合同生效后，甲依约将木板运送至乙所在地，乙认为木板质量不合标准，要求退货。由于甲、乙签订的买卖合同中没有明确规定标的物质量要求，于是甲与乙协商，建议乙改变该批木板的用途，同时向乙承诺适当降低木板的售价。乙同意甲的建议，但要求再延期一个月付款，甲同意了乙的要求。在此期间甲因资金周转困难，遂要求丙履行担保责任，丙以乙的付款期限未到为由拒绝履行。于是甲将合同权利转让给丁，同时通知了乙、丙。乙、丁经协商达成协议，乙给丁开出并承兑了一张商业承兑汇票。汇票到期后，丁持该汇票向银行要求付款，因乙在该银行账户上的资金不足银行不予支付。要求：根据上述事实及有关法律规定，回答下列问题：（1）甲、乙签订的买卖合同中对标的物的质量要求在没有约定的情况下，应如何确定标的物质量的履行规则（2）甲、丁之间的合同权利转让行为是否符合法律规定并说明理由。（3）甲将合同权利转让给丁后，丙对甲承担的质押担保责任是否对丁有效并说明理由。（4）丁在汇票不获付款后，可以行使何种票据权利行使的程序是什么
I was only about six that he held his hand 46．______me．I took it in me and we walked．Then 47．______him, "Grandpa, how come you have 48．______so much lines on your hand" He laughed and 49．______said, “Well, that’s a big question!" He was 50．______silent for a moment．So he answered slowly, 51．______"Each these lines stands for a trouble in my 52．______life." I looked at his other hands. " But Grandpa, 53．______what do you have more lines on that one" 54．______" Because there are more the honors and joys 55．______in my life.” （50）处填入（）
简述细菌生长与繁殖的条件。
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