问题 填空题

(1)经研究发现,长期使用我国发明的铁锅做饭,可以有效地减少缺铁性贫血的发生,原因是: _________ ;如果炒菜时经常加入适量的实用醋,效果会更好,理由是 _________

(2)某园林工人配置农药波尔多液时,将胆矾(CuSO4·5H2O)晶体、生石灰(CaO)分别与水按1:50的质量比混合(胆矾溶于水得CuSO4溶液),然后把得到的两种液体在木桶里混合并充分搅拌.

①配置波尔多液不用铁桶的原因是 _________

②若要检验所配的波尔多液中是否还含有CuSO4,实验的方法是 _________

答案

(1)用铁锅做饭会使少量单质铁进入人体,与胃酸反应转变成可被吸收的Fe2+;在炒菜过程中,醋酸可以与单质铁发生反应,生成可被人体吸收的Fe2+

(2)①铁能与硫酸铜发生置换反应;②将一根光亮的铁丝插入波尔多液中,观察铁丝表面是否变红.

单项选择题
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The world is filled with smart, talented, educated and gifted people. We meet them every day. A few days ago, my car was not running well. I pulled it into a garage and the young mechanic had it fixed in just a few minutes. He knew what was wrong by simply listening to the engine. I was amazed. The sad truth is, great talent is not enough.

I am constantly shocked at how little talented people earn. I heard the other day that less than 5 percent of Americans earn more than $100, 000 a year. A business consultant who specializes in the medical trade was telling me how many doctors and dentists struggle financially. It was this business consultant who gave me the phrase, “They are one skill away from great wealth.”

There is an old saying that goes, “Job means‘ just over broke (破产)' ”. And unfortunately, I would say that the saying applies to millions of people. Because school does not think financial intelligence is intelligence, most workers“ live within their means”. They work and they pay the bills. Instead I recommend to young people to seek work for what they will learn, more than what they will earn.

When I ask the classes I teach, “How many of you can cook a better hamburger than McDonald's?” almost all the students raise their hands. I then ask, “So if most of you can cook a better hamburger, how come McDonald's makes more money than you?” The answer is obvious: McDonald's is excellent at business systems. The reason so many talented people are poor is because they focus on bui1ding a better hamburger and know little or nothing about business systems. The world is filled with talented poor people. They focus on perfecting their skills at building a better hamburger rather than the skills of selling and delivering the hamburger.

小题1:The author mentions the mechanic in the first paragraph to show that     .

A.he is just one of the talented people

B.he is ready to help others

C.he has a sharp sense of hearing

D.he knows little about car repairing小题2:The underlined part in the third paragraph can be best replaced by       .

A.spend more than they can afford

B.do in their own way

C.live in their own circle

D.live within what they earn小题3:Why do talented people earn so little according to the author?

A.They don't work hard enough.

B.They lack financial intelligence.

C.They don't make full use of their talents.

D.They have no specialized skills.小题4:The success of McDonald's lies in its       .

A.skills at making hamburgers.

B.good business systems

C.talented workers

D.excellent service小题5:The main purpose of the author is to tell us       .

A.how young people can find a satisfactory job

B.what schools should teach students

C.why so many talented people are poor

D.how McDonald's makes much money