问题 选择题

传统的“陈醋”生产过程中有一步称为“冬捞夏晒”,是指冬天捞出醋中的冰、夏日暴晒蒸发醋中的水分,以提高醋的品质.下列结论错误的是(  )

A.食醋中的水要比醋酸容易蒸发

B.调味品的食醋含3%-5%的乙酸

C.食醋可除去热水瓶胆中的水垢

D.冰醋酸是由冰和醋酸混合而成

答案

A、醋酸分子间存在氢键,导致其沸点较高,沸点为117.9℃,所以水要比醋酸容易蒸发,故A正确;

B、调味品的食醋含3%-5%的乙酸,故B正确;

C、醋酸酸性强于碳酸,醋酸可以和水垢的主要成分碳酸钙反应,故C正确;

D、无水醋酸俗称冰醋酸,冰醋酸是纯净物,故D错误.

故选D.

判断题
阅读理解

阅读理解

     When we think of leadership, we often think of strength and power.But what are these really, and

how do they operate?

     Leadership today is not about forcing others to do things.Even if this is possible, it is shortterm, and

tends to produce unexpected and unwanted results.If you order someone to do something against their

will, they may do it because they feel they have to, but the anger they feel will do more harm in the long

term.They will also experience fear.

     Fear causes the thinking brain to shut down, making the person unable to function at his or her best.If

they connect you with this emotion of fear, they will become less functional around you, and you will have

succeeded in not only shooting yourself in the foot, but possibly making a very good employee or partner

unable to perform effectively.Fear does no good to leadership.

     The way we influence people in a lasting way is by our own character, and our understanding and use

of emotion.We can order someone to do something, which may be part of the work day; or we can

employ them at the emotional level, so they will become fully devoted to the projects and provide some

of their own motivation.Today's work place is all about relationships.

     Anyone works harder in a positive environment in which they're recognized and valued as a human

being as well as a worker.Everyone produces just a bit more for someone they like.Leaders understand

the way things work.They know the pay check is not the single most important factor in the work life of

most people.

     The true strength of leadership is an inner strength that comes from the confidence of emotional

intelligence-knowing your own emotions, and how to handle them, and those of others.Developing your

emotional intelligence is the single best thing you can do if you want to develop your relationship with

people around you, which is the key to the leadership skills.

1. The writer thinks that it is not________for us to connect leadership with strength and power.

A. possible  

B. necessary

C. easy  

D. effective

2. People may NOT be working hard when________.

A. they're regarded as human beings

B. they like their leaders

C. money is taken as the most important

D. leaders understand the way things work

3. From the passage, we can conclude that________is the key to making a good leader.

A. developing one's emotional intelligence

B. in fluencing others in one's own way

C. producing some unexpected results

D. having confidence in one's ability

4. This passage is most helpful to those who________.

A. have strength and power

B. are going to make a speech

C. would like to be leaders

D. are to be excellent employees