Is oxygen are the only gas____ helps fire burn?A.thatBwhichC.it为什么不能选B?

Is oxygen are the only gas____ helps fire burn?A.thatBwhichC.it为什么不能选B? The two elements _____water is made are th oxygen and hydrogen.A thatB whichC of whichD with which Is there life on Mars(火星)?We do not know.We are sure that earth people like us cannot live on Mars.Earth people need oxygen（氧气）to breathe(呼吸),but there is almost no oxygen on Mars. Living on Mars is like living on a very high mountain the amount of substance of oxygen atoms is The journey is still on,we are on the way of which 做什么成分The two elements of which water is made are oxygen and hydrogen.The two elements of which water is made 主语 也是从句 are 谓语 oxygen and hydrogen 宾语 water is (made of) two elements 这么看 of which 做状语从 Things are known _when they unite with the oxygen of the air.(burn) 英语翻译category of premise is fire hazardous.solid combustible and hard combustible substances and materials,whice are capable only to burn when reacting with oxygen of the air or interacting with each other,are circulating in the premise.这句 Is oxygen the only gas( ) helps fire burn?Is oxygen the only gas( ) helps fire burn?A.it B.which C.不填 D.that I thought you are the oxygen,but a farce originally,loved a lost completely I thought you are the oxygen,but a farce originally,loved a lost completel 请大家帮分析这句,这是个什么从句?we breathe on earth这是单独的一个句子吗?we前有没有少关系词呀?it is bacteria that have generated the oxygen we breathe on earth 英语翻译The Method2.1 Biochemical Oxygen Demand (BOD)The biochemical oxygen demand (BOD) of waste water,industrial effluents and surfacewater is an expression for the amount of oxygen consumed by the decomposition oforganic matter in a biochemica 英语翻译The interfacial adhesion of CF reinforced polymercomposite is poor because CF has chemically inert andsmooth surface,and the oxygen containing functionalgroups are very few.Much research has been conductedto enhance the adhesion between C 作业是英文的,xxx+oxygen=carbon dioxide+xxxthe equation below shows the process in cells in which oxygen is used and carbon dioxide is produced 英译汉一句 thanks1.5 Since the rate of combustion is closely dependent upon the concentration of oxygen present,an enriched oxygen atmosphere (greater than 21% vol) becomes a hazard. The cattle____grazing on the grassy hillside.(are,is) 填空题 THAT不能引导定语从句吗The two elements（ ）water is made are the gases of oxygen and hydrogen.我觉得空白处写THAT答案是WHICH请知者辨析下,谢谢啦