问题 填空题

从H、O、C、S、Ca五种元素中,选择适当的元素组成符合下列要求的化学用语填空.

(1)常用作干燥剂的氧化物是______;酸雨中含有极少量的酸是______;

(2)绿色植物进行光合作用的化学方程式______,生成两种气体的分解反应______.

答案

(1)氧化钙的化学式为CaO;已知氢元素的化合价为+1价,硫酸根的化合价为-2价,先标注化合价,再利用化合价数值交叉法书写化学式H2SO4

(2)绿色植物进行光合作用的化学方程式为6CO2+6H2O

光照、叶绿素
C6H12O6+6O2

故答为:(1)CaO;H2SO4

(2)6CO2+6H2O

光照、叶绿素
C6H12O6+6O2;生成两种气体的分解反应2H2O
 通电 
.
 
2H2↑+O2

阅读理解

“Why does the chicken cross the road? To get to the other side!”

That’s an old joke in the west, but it came to my mind again when I saw people crossing the road at the intersection of Shanxi Road and Huaihai Road in Shanghai.

When the traffic light was red, a group of people were waiting for the light to change. Suddenly one man began rushing to the other side of the road. Soon others followed him at the crossing and more people did the same. Just like chickens, they didn’t mind the honking horns(喇叭声) and kept crossing the road in a mess.

Every year several thousand people are either killed or hurt on the roads in Shanghai. And at least one third of them were jaywalking(乱穿马路). Jaywalking is very common in Shanghai. It seems that jaywalkers are not afraid of the danger to themselves.

Traffic laws are to keep people safe. So we should obey them, and have good road-crossing habits. When someone starts to jaywalk, we should stop him, and never follow him. That way we can avoid the traffic accidents.

小题1:The underlined word “intersection” here probably means “       ”.

A.road

B.bridge

C.crossing

D.traffic小题2:The writer saw people      in Shanghai that day.

A.crossing the road in a mess

B.waiting for the green light patiently

C.crossing the road with chickens

D.hurting each other in the street小题3:How does the writer like what he saw in Shanghai that day?

A.He thinks it’s OK.

B.He thinks it’s wrong.

C.He has no idea of it.

D.He doesn’t mention it

单项选择题 A1/A2型题