问题 推断题

A、B、C、D、E、F六种常见的单质或化合物在一定条件下有如下图所示的相互转化关系,所有反应物和生成物均已给出。

(1)若B在常温下为液态;C是一种有磁性的化合物;E是一种无色、无味的有毒气体。则反应③的化学方程式______________。

(2)若B由两种元素组成,其简单离子的电子层结构相同;绿色植物的光合作用和呼吸作用可实现自然界中D、E的循环。则B的电子式为_________________,11.6gA和E组成的混合气体与足量的B固体反应,固体增重3.6g,则A、E混合气中E 的体积分数为_________________________。

(3)若A和E都是第四周期常见的金属单质,其余都是常见的盐,反应①②③都在溶液中进行,则B、C、F氧化性由强到弱顺序为(用离子符号表示)_________________。

答案

(1)CO+H2OCO2+H2

(2);20%

(3)Fe3+>Cu2+>Zn2+

选择题
阅读理解

Once a circle lost a piece of its own. The circle wanted to be whole, so it went around looking for its missing piece. But because it was incomplete(不完整的), it could only roll very slowly. It enjoyed the flowers and the sunshine along the way. It talked with worms. It found lots of different pieces, but none of them fit. So it left them all by the side of the road and kept on looking for the missing piece.

Then one day the circle found a piece that fit perfectly. It put the missing piece into itself. It could be whole, with nothing missing. It was so happy and began to roll. Now that it was a perfect circle, it could roll very fast, too fast to see flowers or talk to worms. It realized how different the world was when it rolled so quickly. It felt so sad that it stopped, left its found piece by the side of the road and rolled away slowly.

Sometimes we are perfect when we lost something. A man who has everything is a poor man in some ways. He will never have hopes, dreams or something better. He will never know someone is loving him or someone is giving him something he has always wanted or never had.

We couldn’t be perfect, but we must be brave enough to love, strong enough to forgive, kind enough to share happiness with others and clever enough to know there is enough love around us and then we can always live a wonderful time in our lives.

小题1:The circle rolled very slowly because it __________.

A.spent much time talking to worms

B.wanted to enjoy the sunshine

C.was looking for its missing piece

D.lost a piece of its own小题2:After it was whole again and rolled fast, the circle __________.

A.felt unhappy

B.could see more beautiful flowers

C.could talk to any worm

D.could go everywhere小题3:If a man owns everything, he’ll be __________ in some ways.

A.perfect

B.poor

C.happy

D.strong enough小题4:The story mainly tells us that __________

A.nobody loves us if we give nothing

B.a man who has everything is the happiest

C.losing something may not be a bad thing sometimes

D.we are not whole when we lose something