根据第一段第一行 “Airis not just one gas, it is a mixture of different gases,空气不仅仅是一种气体,它是不同气体的一个混合” 可知答案为 C , 空气是不同气体的一个混合;A 项:空气只是一种气体;B 项:空气是两或三种气体的混合,第二段第一句提到 “空气中主要有四种气体” 故 B 错误;D ...
Air is not just one gas. It is a mixture of different gases. Because we can't see the gases in the air, it is difficult to think about them.There are four main gases in the air: oxygen (氧气) , nitrogen (氮气), carbon dioxide (二氧化碳)and argon(氩) .If 1,000 dots can ...
解析 B [解析] 文中“which(关系代词),引导非限制性定语从句,作主语,指代其前边的‘地球上记录到的最低温度’”和“in Antarctica in 1983(1983年在南极洲)”,很明显应选B项occurred发生,出现。结果一 题目 What Is the Coolest Gas in the Universe’. What is the coldest air temperature ever recorded ...
What is the main gas that plants take in from the air? A. Oxygen B. Carbon dioxide C. Nitrogen D. Hydrogen 相关知识点: 试题来源: 解析 B。本题考查植物的生理过程。植物主要从空气中吸收二氧化碳进行光合作用,选项 A 氧气是植物释放出来的;选项 C 氮气不是植物主要吸收的气体;选项 D 氢气也不是...
i learned that someti i learned to lie i leave the gas on i left a note on his i let out an i let tears fall like i let you happy in ot i lifted his head i light a cigarette i like a cat in the d i like bangin strippe i like basketball i like birthday prese i like coun...
In this lesson, learn what is petroleum and understand what is petroleum made of and how it is extracted and refined. Related to this QuestionWhat is the main gas found in the air? What is the main gas found in the air we breathe? Hint: It's around 78% of the air. Which one ...
27 What can we learn about Kate-from the passage? A. She is skilled in reading stories. B. She has made the show in the wild. C. She has ever read the story to others. D. She has helped the baby owl overcome his fears.
is everything i want is falling down on al is format of is gone ang i find mg is good at sports is growing and profit is hit twice in succe is internet society is it a bit over the is it a tale of gods is it me or is the me is kept out backgroun is killing me now is ...
4. Where does the conversation take place? A. In a restaurant. B. In a police station. C. In a car. 5. What is the man going to do tomorrow? A. Pay the bill. B. Check the mailbox. C. Fix the gas cooker. 第二节(共15小题:每小题1.5分,满分22.5分) ...
What is the pressure of the gas in the mercury manometer if h = 55 mm and atmospheric pressure is 760 mmHg? A. 815 mmHg B. 760 mmHg C. 55 mmHg Manometer: In fluid mechanics, manometers are the devices used to measure ...