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文学最早的源头是（）
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胃癌好发于（）。

建筑中使用的塑料装饰材料、家具包布等装饰用纺织品，若材料燃烧性能为B1级时，氧指数应大于等于（）。（中）

对相关部门发现的潜在不合格现象以（）传达到相关部门进行预防改善。

根据下列短文，回答题。　　Despite the fact that today viruses(病毒)are known to cause cancer in animals and incertain plants，there exists a great reluctance to accept viruses as being of importance in humancancer．Basic biological phenomena generally do not differ strikingly as one goes from one spe—cies to another．It should be recognized that cancer is a biological problem and not a problemthat is unique for man．Cancer originates when a normal cell suddenly becomes a cancer cellwhich multiplies widely and without apparent restraint．Cancer may originate in many differentkinds of cell，but the cancer cell usually continues to carry certain traits(特性)of the cell of origin．The transformation of a normal cell into a cancer cell may have more than one kind of cause．but there is good reason to consider the relationships that exist between viruses and cancer．　　Since there is no evidence that human cancer，as generally experienced，is infections，manypersons believe that because viruses are infections agents they cannot possibly be of importancein human cancer．However，viruses can mutate(突变)and examples are known in which a vi．rus that never kills its host can mutate to form a new strain of virus that always kills its host．Itdoes not seem unreasonable to assume that an innocuous(无害的)latent(潜伏的)virus mightmutate to form a strain that causes cancer．Certainly the experimental evidence now available isconsistent with the idea that viruses as we know them today，could be the causative(引起……的)agents of most，if not all cancer。including cancer in mall．Cancer should be considered to be a biological problem rather than a medical one because_________．

可用于耐氯喹疟疾时控制症状治疗的有（　）

肝脏中含量最多的酶是（）

（）不属于油漆实际干燥时间测定方法。

在处理保守医密与讲真话二者关系时应该对（）

列关于基金的交易价格与基金资产净值叙述正确的是（）。

高炉铁口的作用是（）。