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 ...
What is the only by-product when we burn hydrogen for energy?A、oxygenB、waterC、electricityD、gasoline 相关知识点: 试题来源: 解析 B (1) 考查细节理解。根据第一段第一句Mario loved to have lots of friends at school.She showed off a lot可知,她常炫耀自己有很多朋友。故选C。 (2) 考查...
What is the purpose of respiration? A. To produce oxygen B. To store energy C. To release energy D. To absorb carbon dioxide 相关知识点: 试题来源: 解析 C。呼吸作用的目的是释放能量供生物体生命活动所需。呼吸作用消耗氧气产生二氧化碳,不是产生氧气和吸收二氧化碳,也不是储存能量。
What is the atomic number of oxygen?A、2B、6C、8D、20Answer:C科目四考试网___科目四考试题库
百度试题 结果1 题目What do you know the (percent) of oxygen in air is? 相关知识点: 试题来源: 解析 percentage 根据句子意思和结构,考查percent “百分之…的”转变为percentage“百分率”的运用。反馈 收藏
A. what B. which C. that D.it 相关知识点: 试题来源: 解析 3.C 【解析】考查定语从句的关系词。 句意:氧气是能助 燃的唯一气体吗?先行词为gas,指物,该空在从句中作 主语,不可省略,且先行词前有 the only 修饰,引导词只 能用 that 而不能用 which。 故选 C。 反馈 收藏 ...
相关知识点: 试题来源: 解析 B。原因:文中提到“In industry, oxygen has many applications. It is used in steelmaking to remove impurities from iron. It is also used in the production of chemicals such as sulfuric acid.”。 反馈 收藏
What is the effect of deforestation? A. Increase in oxygen production B. Reduction in soil erosion C. Loss of wildlife habitats D. Increase in rainfall 相关知识点: 试题来源: 解析 C。解析:砍伐森林会导致野生动物栖息地的丧失。砍伐森林会减少氧气产生、增加土壤侵蚀、减少降雨。
这个句子的主语是water,谓语是will continue to be,表语是what it is today,补语是next in importance to oxygen.what 在句子中表示"什么的样子"就像She is no longer what she was ten years ago.她不再是十年前的样子了.as 不能引导表语从句.而how 是作状语,表示怎样.which指哪一个...
百度试题 结果1 题目What is the main gas in the atmosphere that plants need for photosynthesis? A. Oxygen B. Nitrogen C. Carbon dioxide D. Hydrogen 相关知识点: 试题来源: 解析 C。解析:植物进行光合作用需要二氧化碳。反馈 收藏