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一般来说，人口结构按照其结构所具有的质的规定性分为（）
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属于版权的是（）
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Chinas young need some form. of sex education. What will they get from it? What is the best way to teach【C1】______? Michael: Im a college student. But I havent【C2】______any sex education from either teachers or parents. In the cyber age, students can get information【C3】______many ways. For teenagers, sex knowledge is important. It will【C4】______their attitudes towards sex. If they get it from pornography(色情文学), their【C5】______towards sex will be unhealthy and they cant deal well with the opposite sex and love. Anna: In recent years, more young【C6】______have had premarital pregnancies(受孕).I think the reason is【C7】______the young are full of curiosity about sex and have no idea about it. Also,【C8】______young girls have been raped, and【C9】______of them have no knowledge about sexual self-protection. So, parents and teachers should【C10】______traditional ideas about sex education for young students to avoid【C11】______harm. Geng Shanshan: In my opinion, Chinese teenagers do need sex education. It is necessary for them to form. a correct view of the opposite sex. It can also【C12】______strengthen young peoples sense of self-protection,【C13】______will control them from doing something【C14】______. Teenagers can get a lot of benefit by receiving such education. Luke: In my opinion, sex education videos could be an effective means to tell young people【C15】______they should know. And, it would be【C16】______easier if boys and girls watched them separately. In addition, communication is necessary : school authorities could【C17】______a hot line to answer students questions about sex. Ding Fei: Sex is the important topic that teachers and parents want to【C18】______. In my opinion, to change this situation, we must first make it【C19】______to teachers and parents that sex education is needed to guarantee(保证)the healthy growth of the young. Obviously, without their participation, sex education will【C20】______be successful.【C1】A．themB．himC．herD．us
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临床Ⅲ期的滋养细胞肿瘤化疗宜选用（）。
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患者男，68岁。因记忆力减退3年，生活自理能力下降半年入院。3年前家人发现患者经常丢三落四，东西放下就找不着了，熟悉的物品说不上名字，只会说"那样东西"，情绪低落发呆，话少。病情逐渐加重，1年前不会烹饪自己熟悉的菜肴，见着老邻居不知叫什么名字，经常走错房间，外出不知回家的路，认为家人嫌他笨，说活着还不如死了好，孤僻懒散。半年前生活自理能力下降，不能胜任简单的家务，不会正确穿衣服，吃饭不知饥饱，自语痴笑，举止幼稚。查体神经系统无明显阳性体征。头颅CT示广泛性脑萎缩。此患者最可能的诊断是（）
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关于负温钢结构的制作，下面说法错误的是（）。
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真头痛一名，首见于
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旅行支票无折转账签发21013交易，需后台核准时（对私），要拍摄的凭证有（）。
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压浆浆体材料的配制有何要求？
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消化性溃疡的常见病因有哪些？