下列叙述正确的是______________。 ①SO2、NO、NO2都是形成酸_爱下问搜题

搜题请搜索小程序“爱下问搜题”

问题填空题

下列叙述正确的是______________。

①SO₂、NO、NO₂都是形成酸雨的因素，都能和水反应生成酸

②除去CO₂中少量的SO₂，将混合气体通过饱和Na₂CO₃溶液

③水晶的主要成分是SiO₂

④SiO₂与CO₂都属于酸性氧化物，都不能与酸反应

⑤将CO₂通入饱和Na₂CO₃溶液中有沉淀产生，继续通入CO₂沉淀溶解

⑥某酸雨样本采集后放置一段时间，pH由4．68变为4．28，是因为水中溶解了较多的CO₂

⑦CO₂不能与CaCl₂溶液反应，SO₂也不能与CaCl₂溶液反应

⑧实验室可用NaOH溶液处理NO₂和SO₂废气

⑨用稀双氧水清洗伤口可以杀菌消毒

⑩NO只能用排水集气法收集，不能用排空气法收集；而NO₂只能用排空气法收集，不能用排水集气法

答案

③⑦⑧⑨⑩

题目分析：①NO不能与水反应，错误；②CO₂也与Na₂CO₃溶液反应，应该用饱和碳酸氢钠溶液，错误；④SiO₂与氢氟酸反应，错误；⑤生成NaHCO₃沉淀，NaHCO₃不能继续与CO₂反应，错误；⑥是因为弱酸H₂SO₃被氧化为强酸H₂SO₄，错误；⑨双氧水具有强氧化性，可以使蛋白质发生变性，正确；⑩NO与氧气反应、NO₂与水反应，正确。

问答题

根据意思写出诗句。

1．五岭山脉那样高低起伏，绵延不绝，可在红军眼里不过像翻腾着的细小波浪；乌蒙山那样高大雄伟，气势磅礴，可在红军看来，不过像在脚下滚过的泥丸。

____________________________________________________________________________

2．更使红军欣喜的是翻过了千里皑皑白雪的岷山，人人心情开朗，个个笑逐颜开。

____________________________________________________________________________

完形填空

The famous scientist Albert Einstein died in 1955. His___36__ now is in the central state of Kansas of the U.S. It belongs to a retired ___37__ doctor, Thomas Harvey. ___38__ did this happen? And why?
In the 1950s, Albert Einstein and Thomas Harvey __39__ each other when they both lived in Princeton, New Jersey. Einstein was working at Princeton University____40__ Doctor Harvey was working at Princeton Hospital. When Einstein died, Doctor Harvey was __41__ to examine his body. It was then that he started to study __42__ has become a long time examination of Einstein's brain. His goal was to __43__ some physical evidence of the scientist's genius.
Doctor Harvey, ___44__, did not tell Einstein's family that he __45__ the great man's brain. It was only later ___46__ the family learned of Doctor Harvey's work. They did not ___47__ the idea at first. After Doctor Harvey explained his idea to them, they agreed to __48__ him to study the brain. Doctor Harvey then asked __49__ scientists to help. They cut the brain __50__ three pieces. They marked each piece before placing it in containers __51__ chemical formaldehyde (甲醛) to protect it. Doctor Harvey has been ___52_ Einstein's brain since then. He has carried it with him as he moved from place to place. He has also lent parts of the brain to other scientists ___53__ study.
Only one researcher has found something ___54__. A doctor at the University of California found that the left part of Einstein's brain has more certain cells (细胞) than __55__. Such cells are known to feed brain. This may mean that the cells could affect intelligence.

D．two another