What is one of the most important compounds of oxygen? A. Hydrogen (H₂) B. Water (H₂O) C. Carbon monoxide (CO) D. Nitrogen (N₂) 相关知识点: 试题来源: 解析 B。原因:文章中明确提到“One of the most important compounds of oxygen is water (H₂O).”。 反馈 收藏 ...
Is Oxygen the only gas ___ helps fire burn? A. it B. which C. what D. that 相关知识点: 试题来源: 解析 [答案]D [解析] [详解]考查定语从句。句意:氧气是唯一能让火燃烧的气体吗?本句是限定性定语从句,从句修饰名词 the only gas,the only gas是物体,名词被the only修饰时,关系词只能...
This book___that our world is in danger. It is vital that we do something to save the earth. First of all, what are the___to our environment? The writers ask us to ‘imagine the earth inside a kind of greenhouse with the atmosphere around it ___like the g...
解析 A核心短语/词汇:help sb./ sth. (to) do sth. 帮助某人/某物做某事句子译文:氧气是唯一的助燃气体吗? 本题考查定语从句。___helps fire burn 用来修饰之前的名词gas, 该从句的引导词在定语从句中做主语,不能省略,先行词有only 修饰时不能用which; what 不能引导定语从句,故选项A符合题意。反馈...
题目What is the product of the reaction between hydrogen and oxygen? A. Nitrogen B. Carbon dioxide C. Water D. Chlorine 相关知识点: 试题来源: 解析 C。氢气和氧气反应生成水。氮气、二氧化碳和氯气都不是氢气和氧气反应的产物。反馈 收藏
A.that B./ C.what D.it相关知识点: 试题来源: 解析 A 考查定语从句。Gas为先行词,在定从___ helps fire burn中作主语,且that作主语时不可省略。所以选A。 分析总结。 gas为先行词在定从helpsfireburn中作主语且that作主语时不可省略反馈 收藏 ...
解析 C 关系代词what在这里引导一个名词性从句作to be的表语,同时what在表语从句中又为is的表语成分,这类语法结构还有,如:Show what you have written.(把你所写的给我们看看)和She is not what she was a few years ago.(她可不是几年前的她了)。其他选项均不能表示这种语法关系。
It would seem that an introduction to oxygen is unnecessary, for we deal with it and depend upon it every moment of our lives. Oxygen is to us the essential stuff of the air we breathe. We are aerobic animals who obtain energy by oxidizing foodstuffs. As such, we are wholly dependent ...
Oxygen is not dangerous. Byanon229958— On Nov 16, 2011 Oxygen concentrators are quite amazing. They help so many people with respiratory problems by concentrating air with oxygen and delivering it to them. The best part of that is that now those who couldn't go out and do things because...
Is oxygen the only gas ___helps fire burn?( )A.thatB./C.whichD.what 相关知识点: 试题来源: 解析 答案A解析:考查定语从句.先行词 gas,helps fire burn是定语从句,关系词在定语从句中做主语,指物,又因为先行词被the only修饰,故用that.故选:A. 氧气是能帮助火燃烧的唯一气体. 结果一 题目...