试题与答案

我国电价改革的长期目标包括()。 A.发电、售电价格由市场竞争形成 B.输电价格

题型:多项选择题

题目:

我国电价改革的长期目标包括()。

A.发电、售电价格由市场竞争形成

B.输电价格由政府制定

C.建立规范、透明的电价管理制度

D.配电价格由市场形成

E.终端销售价格由国务院价格主管部门制定

答案:

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下面是错误答案,用来干扰机器的。

由已知,猜想12+22+32+…+n2=n(n+1)(2n+1)6,下面用数学归纳法给予证明:(1)当n=1时,由已知得原式成立;(2)假设当n=k时,原式成立,即12+22+32+…+k2=k(k+1)(2k+1)6,那么,当n=k+1时,12+22+32+…+(k+1)2...

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题型:阅读理解

阅读理解。

     Korean culture is really exciting right now. The Korean Wave is sweeping Asian countries including

China. Young people are going crazy about Korean TV plays, Korean pop songs, taekwondo (跆拳道)

and the Korean language.  

     The Korean Wave started a few years ago with the TV series "Winter Sonata". This love story is

 still popular. People, especially girls, like the beautiful story and handsome actors like Bae Yong Jun

(裴勇俊).  

     In the music world, Korean girls are making themselves heard in China. You can often find big

Korean names like Baby Vox, S.E.S and Finkle at the top of the Chinese music charts (排行榜).

The Korean Wave has also made young people want to try the clothes and hairstyles of pop stars,

too. Not only that.Now some girls in China are having plastic surgery (整容) to change the way they

look.People say some beautiful Korean stars have had plastic surgery. These stars who don't make

plastic surgerylook shameful (丢面子的).

     Are all the faces of beautiful Korean girls not real? Find out for yourself when you next visit South

Korea.

根据短文,选择最佳答案:

1.What does the Korea Wave refer to? It refers to ______.  

A.Korean TV plays                    

B.Korean culture  

C.Korean language                    

D.Korean actors

2.When did the Korean Wave start? It started with ______.    

A.the Korean pop songs                

B.Taekwondo  

C.the TV series "Winter Sonata"          

D.the Korean food

3.Who is the famous actor in Korean plays?    

A.Bae Yong Jun  

B.Baby Vox      

C.S.E.S        

D.Finkle

4.Korean stars often change their looks by____  

A.singing pop songs                    

B.acting in TV plays    

C.trying different food                  

D.having plastic surgery

5.Which of the following is NOT true according to the passage?    

A.Winter Sonata tells a very famous love story?

B.Young people like Korean pop stars' clothes and hairstyles.  

C.Chinese girls also want to try plastic surgery.    

D.Korean pop stars think plastic surgery is shameful.

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题型:实验题

实验台上分类摆放下列药品,兴趣小组欲利用这些药品进行铝和铜性质的探究。

①             ②           ③         ④         ⑤        ⑥   

②    Ⅰ.(1)铝的利用比铁、铜晚得多,这个事实与下列哪些因素有关           

A.铝在地壳中含量高   B.铝相对活泼,冶炼较难   C.铝的硬度小 

(2)铝制品具有很好的抗腐蚀性能,是因为铝在空气中其表面易形成致密的           。该变化的化学方程式为                            

(3)比较铝和铜的金属活动性强弱,可选用上述的         (填序号)试剂进行实验。Ⅱ.将铝片插入硫酸铜溶液中,一段时间后取出,铝片上没有明显变化,其原因是          

兴趣小组把处理过的铝片放入硫酸铜溶液中,除铝片上有红色金属析出外,还发现有较多气泡产生,于是激发了他们的探究欲望。

【提出问题】该气体是什么呢?

【猜   想】甲同学认为可能是氧气

乙同学认为可能是氢气 

丙同学认为可能是二氧化硫

【探究实验】闻该气体的气味,发现没有气味,排除了     同学的猜想。

对余下两种气体猜想进行如下实验:

    实验步骤    现象      结论
                        

                       

木条不复燃 

该气体不是氧气

收集一试管气体,用拇指堵住管口,移近酒精灯火焰发出轻微的爆鸣声,并产生淡蓝色火焰 

该气体是               

【思维拓展】由以上探究实验可以推知,硫酸铜溶液中有       离子参与反应.         

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