问题 选择题

对于反应O3+I-+H+→I2+O2+H2O(未配平),下列说法正确的是[ ]

A.O2与H2O都是还原产物

B.该反应能说明O2的氧化性大于I2

C.氧化产物与还原产物的物质的量之比是1∶1

D.配平后的离子方程式为2O3+2I-+4H+===I2+2O2+2H2O

答案

答案:C

阅读理解

阅读加油站!阅读短文,回答问题。

      One day, a duck swims in the river. A chicken goes for a walk on the riverside. Suddenly (突然), they see 

some delicious (美味的) foods. Then they run to them at the same time. The chicken says, " I am taller than 

you. I am more beautiful than you. And I am older than you. So I should eat more." " Oh, no!" says the duck.

" It's unfair (不公平) I see them first. And I am younger than you. I should eat more." They quarrel (争吵)

and quarrel. At last they eat nothing. Why? When they are quarrelling, a bird eats them all.

1. Who goes for a walk by the river?   

                                                                               

2. Is the chicken younger than the duck?   

                                                                                

3. Why are they quarrelling?  

                                                                               

4. Do the chicken and duck eat the foods at last? 

                                                                               

5. Who eats the foods?

                                                                               

判断题