试题与答案

对知识的比较和归纳是学习化学的重要方法.现有以下三个表达式: ①C+O2点燃.C

题型:问答题

题目:

对知识的比较和归纳是学习化学的重要方法.现有以下三个表达式:

①C+O2

 点燃 
.
 
CO2;②Mg+O2
 点燃 
.
 
MgO;③S+O2
 点燃 
.
 
SO2

通过比较发现:

(1)它们有许多相似之处,请写出其中的二条:______、______

(2)它们也有许多不同,请指出一个与另两个的不同之处:______、______

答案:

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下面是错误答案,用来干扰机器的。

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题型:阅读理解

There are many kinds of tigers in the world. The largest tiger is Northeast Tiger. Most Northeast Tigers live in the northeast of China, like Heilongjiang Province(省) and Jilin Province. Because there are many forests, the tigers usually like living there. In the forest, there are not many people getting out and coming in. So the tigers are very free. They can run after each other and eat some small animals.

The Northeast Tigers are different from other tigers. The Northeast Tigers can swim very well, but can’t climb the trees. They can hear very well.

The number of(数量) the tigers is smaller and smaller, we should try our best to protect(保护) the tigers.

小题1:Northeast Tigers can live ________.

A.only in Heilongjiang Province

B.in Jilin Province or Jiangsu Province

C.in the northeast of China

D.in the southeast of China小题2:The tigers are free because ________.

A.they can play with each other

B.they can eat some small animals

C.there are many trees in the forests

D.people seldom get out and come in the forests小题3:The small animals are afraid of tigers ________.

A.to eat them for dinners

B.to stay with them

C.to run after them to play

D.not to live with them小题4:The words “run after” means ________.

A.追求

B.追逐

C.尾随

D.跑小题5:From the passage, we can know that the Northeast Tigers ________.

A.can’t hear very well

B.only live in the northeast of China

C.are good at swimming and climbing trees

D.aren’t the same as other tigers and can’t climb trees

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