问题 选择题

初中毕业复习时,小珊对所学部分化学知识归纳如下,其中有错误的一组是(  )

A

现象与变化

B

性质与用途
①铁锅生锈---化学变化

②干冰升华---化学变化

③铜变成铜绿--化学变化

①N2性质稳定---填充食品袋防腐

②CO2不燃烧,也不支持燃烧-用于灭火

③石墨疏松多孔---可作吸附剂

C

物质与结构

D

“低碳”与环保
①甲烷---由分子构成

②铝由原子构成

③食盐---由离子构成

①改造或淘汰高能耗、高污染产业

②研制和开发新能源替代传统能源

③减少使用一次性餐具

A.A

B.B

C.C

D.D

答案

A、铁锅生锈的过程中能生成新物质铁锈,属于化学变化;干冰升华的过程中没有新物质生成,属于物理变化;铜生锈的过程中能生成铜锈,属于化学变化.错误;

B、氮气的化学性质不活泼,可以用作食品防腐剂;二氧化碳不能燃烧、不支持燃烧,可以用来灭火;石墨疏松多孔,可以用作吸附剂.正确;

C、甲烷是由分子构成的物质;铝是由原子构成的物质;食盐是由离子构成的物质.正确;

D、改造或淘汰高能耗、高污染产业、研制和开发新能源替代传统能源、减少使用一次性餐具等措施有利于环境保护.正确.

故选A.

单项选择题 A3/A4型题
阅读理解

阅读理解

     You're sitting on the train home and the person opposite you yawns ( 打哈欠). Suddenly , you're 

 yawning  with  him , though  you're not tired.

      This phenomenon confused scientists for years until a recent study found that people tend to

sympathize with fellow humans.Supporting this claim was the discovery that those children who were

unable to form normal emotional ties with others did not experience contagious (有感染力的) yawning,

which showed that humans communicate regularly without words.

     Hugo Critchley,a neuroscientist, has conducted an experiment recently, which will prove that

happiness and sadness can spread like the common cold. According to Critchley , our mind and body

are in constant exchange about how we're feeling. " Emotions are closely linked with states of internal

(内部的) responses. " he explained."There are also more visible changes in our gestures and facial

expressions. When we're in a group, these signals can spread to another person. For example, there's

the obvious tendency to smile when smiled at and there are less obvious, changes that reflect emotions

of surprise, anger or sadness such as a change in our heart rate and blood pressure. "

     Hugo Critchley further explained , " Our bodies synchronise and when we like the other person , we

even copy his behavior. Next time you chat with a friend, take note of how you're sitting-it's pretty likely

that you will be the same. Scientists believe it's our way of telling each other that we're partners. Through

body language, humans give each other very subtLe (微妙的) but clear signals that show emotions. "

    So,what lessons can we leam from this? " Spend time with happy people-otherwise your health could

suffer. " said Critchley. " When we're sad,our body goes into fight or flight mode. But when we're happy,

our body works normally and we feel relaxed and positive. So we look bright, our skin glows, we feel

healthy and it affects everyone around us. "

1. According to Hugo Critchley,__________.

A. emotions are as visible as facial expressions

B. we yawn more frequently when we have a cold

C. emotions are connected with states of internal responses

D. the change of blood pressure is not linked with the change ofemotions

2. The underlined word " synchronise"  in Paragraph 4 means"___________"    

A. move slowly                  

B. change rapidly

C. relax temporarily             

 D. respond accordingly

3. From the passage we can learn_________.   

A. sadness is as contagious as happiness

B. anger is less contagious than friendliness

C. surprise is more contagious than smile

D. surprise is the most contagious among emotions

4. Which of the following statements is TRUE according to the passage ?   

A. Emotions have delicate influence on fellow humans.

B. Children like copying the actions of fellow humans.

C. Scientists are still confused about contagious yawning.

D. People tend to communicate more with body language.