题目内容
In every cultivated language, there are two great classes of words which, taken together, comprise the whole vocabulary. First, there are those words（1）which we become acquainted in daily conversation, which we（2）,that is to say, from the（3） of our own family and from our familiar associates, and（4） we should know and use （5 ）we could not read or write. They （6） the common things of life, and are the stock in trade of all who （7） the language. Such words may be called“popular”, since they belong to the people （8） and are not the exclusive （9） of a limited class. On the other hand, our language （10） a multitude of words which are comparatively （11） used in ordinary conversation. Their meanings are known to every educated person, but there is little （12） to use them at home or in the market-place. Our （13） acquaintance with them comes not from our mother's （14） or from the talk of our school-mates, （15） from books that we read, lectures that we （16） ,or the more （17）conversation of highly educated speakers who are discussing some particular （18） n a style appropriately elevated above the habitual（19） f everyday life. Such words are called“learned”, and the （20） between them and the“popular”words is of great importance to a right understanding of linguistic process. 请在7处填上正确答案（）
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目前认为激光对生物体的作用主要有热效应、电磁效应、光化效应、机械效用。
患儿，5岁。因发现水肿、蛋白尿1周入院，临床诊断为单纯性肾病。下列哪项检查结果不可能存在（）
Today ,as in every other day of the year ,more than 3000 U.S. adlescents will smoke their first cigarette on their way to becoming regular smokers as adults. During their lifetime,it can be expected that of these 3000 about 23 will be murdered,30 will die in traffic accidents, and nearly 750 will be killed by a smoking-related disease. The number of deaths attributed to cigarette smoking outweithts all other factors, whether voluntary or involuntary, as a cause of death. Since the late 1970s, when daily smoking among high school seniors reached 30 precent , smoking rates among youth have declined . While the decline is impressive ,several important issues must be raised. First, in the past several years,smoking rates among youth have declined very little. Second,in the late 1970s ,smoking among male high school seniors exceeded that among female by nearly 10 percent . The statistic is reversing.Third ,several recent studies have indicate high school dropouts have excessively high smoking rates, as much as 75 percent . Finally, thouth significant declines in adolescent smoking have occurred in the past decade,no definite reasons for the decline exist. Within this context,the Naional Cancer Instiute (NCI) began its current effort to determine the most effecive measures to reduce smoking levesl among youth. Every day there are over（）high school strdents who will become regular smoker.
2005年1月1日，甲与乙口头约定，甲承租乙的一套别墅，租期为五年，租金一次付清，交付租金后即可入住。洽谈时，乙告诉甲屋顶有漏水现象。为了尽快与女友丙结婚共同生活，甲对此未置可否，付清租金后与丙入住并办理了结婚登记。 入住后不久别墅屋顶果然漏水，甲要求乙进行维修，乙认为在订立合同时已对漏水问题提前作了告知，甲当时并无异议，仍同意承租，故现在乙不应承担维修义务。于是，甲自购了一批瓦片，找到朋友开的丁装修公司免费维修。丁公司派工人更换了漏水的旧瓦片，同时按照甲的意思对别墅进行了较大装修。更换瓦片大约花了10天时间，装修则用了一个月，乙不知情。更换瓦片时，一名工人不慎摔伤，花去医药费数千元。 2005年6月，由于新换瓦片质量问题，别墅屋顶出现大面积漏水，造成甲一万余元财产损失。 2006年4月，甲遇车祸去世，丙回娘家居住。半年后丙返回别墅，发现戊已占用别墅。原来，2004年12月甲曾向戊借款10万元，并亲笔写了借条，借条中承诺在不能还款时该别墅由戊使用。在戊向乙出示了甲的亲笔承诺后，乙同意戊使用该别墅，将房屋的备用钥匙交付于戊。 丙应如何向戊主张自己的权利？理由是什么？
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