问题 多选题

某课外兴趣小组的同学绘制四种实验操作的变化趋势图象,其中正确的是(  )

A.

某温度下,向一定量接近饱和的硝酸钾溶液中不断加入硝酸钾晶体

B.

向硫酸和硫酸铜的混合溶液中加入过量的氢氧化钠溶液

C.

向稀盐酸中滴加过量的氢氧化钠溶液

D.

向等质量的金属镁和铝中分别加入足量且质量分数相等的稀硫酸

答案

A、向一定量接近饱和的硝酸钾溶液中不断加入硝酸钾晶体,硝酸钾溶液达到饱和,但因为温度一定,饱和溶液质量分数不变,所以A错误.

B、加入氢氧化钠首先和硫酸反应,没有沉淀产生,当硫酸反应完全后,继续加入氢氧化钠和硫酸铜溶液反应生成蓝色氢氧化铜沉淀,直至全部转换为沉淀保持不变,所以B正确.

C、因为稀盐酸呈酸性,PH<7,图象的起点是大于7,所以C错误.

D、D中是滴加的酸,所以相当于开始酸不足,导致生成氢气的质量取决于酸而不取决于金属,只有一种金属完全反应时,之后曲线才不重叠.因为硫酸足量,所以最终生成氢气的质量由金属决定,根据方程式可知同质量的镁铝,铝生成的氢气的质量大,所以D正确.

故选BD

阅读理解

The ability to memorize things seems to be a vanishing (消失的) technique.So what can we do to bring out brain cells back into action? A newly published book on memory, Moomvalking with Einstein: The Art and Science of Remembering Everything, by American journalist Joshua Foer, makes a telling point, one that is an analysis of the importance of memorising events and stories in human history; the decline of its role in modem life; and the techniques that we need to adopt to restore the art of remembering.

As For points out, we no longer need to remember telephone numbers.Our mobile phones do that for us.We don't recall addresses either.We send emails from computers that store electronic addresses.Nor do we bother to remember multiplication tables (乘法表) .Pocket calculators do the job of multiplying quite nicely.Museums, photographs, the digital media and books also act as storehouses for memories that once we had to keep in mind.

As a result, we no longer remember long poems or folk stories by heart, feats (技艺) of memory that were once the cornerstones of most people's lives.Indeed, society has changed so much that we no longer know what techniques we should employ to remember such lengthy works.We are, quite simply, forgetting how to remember.

And let's face it, there is nothing sadder than someone who has lost their mobile phone and who finds they cannot even phone home or call their parents or partners because they cannot remember a single telephone number.That is a sad example of loss of personal independence.So, yes, there is a need for us to he able to remember certain things in life.

Therefore, Foer's book outlines the methods that need to be mastered in order to promote our memories and regain the ability to recall long strings of names, numbers or faces.In the process, he adds, we will become more aware of the world about us.

The trick, Foer says, is to adopt a process known as " elaborative encoding", which involves transforming information, such as a shopping list, into a series of "absorbing visual images".If you want to remember a list of household objects—potatoes, cottage cheese, sugar and other items, then visualise them in an unforgettable manner, he says.Start by creating an image of a large jar of potatoes standing in the garden.Next to it, imagine a giant tub of cottage cheese—the size of an outdoor pool—and then picture Lady Gaga swimming in it.And so on.Each image should be as fantastic and memorable as possible.

Using methods like this, it becomes possible to achieve great feats of memory quite easily, Foer says.It certainly seems to have worked for him: he won the annual US Memory Championships after learning how to memorize 120 random digits in five minutes; the first and last names of 156 strangers in 15 minutes; and a deck of cards in under two minutes."What I had really trained my brain to do, as much as to memorise, was to be more mindful and to pay attention to the world around," he says.

These techniques employed by Foer to master his memory were developed by Ed Cooke—a British writer and a world memory championship grandmaster.He acted as Foer's trainer during preparations for the book and helped him achieve his championship performances." Memory techniques do just one thing: they make information more meaningful to the mind, making the things we try to learn unforgettably bright and amusing," said Cooke.

小题1:Which of the following is conveyed in this article?

A.People become more independent with modern equipment.

B.The memory's role in life is declining in modem society.

C.Memory techniques can make information less meaningful.

D.Ed Cooke is the first one who benefited from Foer's techniques.小题2:According to Joshua Foer, people no longer memorize information today because________.

A.museums can do everything for them.

B.they no longer have the ability to memorize things.

C.they have things that can act as storehouses for memories.

D.it is not necessary to memorize anything in modem life.小题3:One method of memorizing things mentioned in the passage is to ________.

A.link things to famous pop stars

B.find the connection between different things

C.form vivid, unforgettable images of certain things

D.use advanced digital imaging technology to help小题4:The underlined word "visualise" in the last paragraph most probably means "_______".

A.imagine

B.undertake

C.remark

D.indicate小题5:This passage can be sorted as ________.

A.a news report

B.an advertisement

C.a scientific discovery

D.a book review

单项选择题