下列有关水的说法正确的是( ) A.水是由两个氢元素和一个氧元素组成的 B.无色

题型:选择题

问题:

下列有关水的说法正确的是(  )

A.水是由两个氢元素和一个氧元素组成的

B.无色、无臭、清澈透明的水就是纯水

C.电解水能生成H2和O2,二者体积比为2:1

D.自然水是硬水,过滤可以使硬水软化

考点:电解水实验硬水和软水
题型:选择题

按朝代顺序写出下列字母所代表的朝代,完成如下填空:

A→商朝→B→春秋→C→秦朝→D→东汉→三国→两晋→E

(1)A          ;B           ;C           ;D           ;E          

(2)A是我国历史上第一个王朝,启继承王位,              制代替              制,从此“公天下”变成“家天下”。

(3)B王朝因为实行                制,出现了“普天之下,莫非王土;率土之滨,莫非王臣”的局面。

(4)C时期              的改革使             国发生根本性的变化。

(5)D时期开通的一条重要商路是                ,对开通这条商路贡献最大的人物是             。这条商路开通的意义是                                  

(6)E时期黄河流域出现了“胡人汉服”“汉人胡食”等现象,这是因为                 改革,加快了                                    的过程。

题型:选择题

阅读短文,回答问题。

残而不废的海伦·凯勒

  小朋友们,你相信奇迹吗?你相信既聋又哑的人也能成为作家吗?有的,这个人便是伟大的海伦·凯勒女士。她在一岁多的时候,因为生病,从此眼睛看不见,并且又聋又哑了。由于这个原因,海伦的脾气变得非常(暴躁、急躁),动不动就发脾气,摔东西。她家里人看这样下去不是办法,便替她请来一位很有耐心的家庭教师苏丽文小姐。海伦在苏丽文小姐的教育下,逐渐改变了。她了解每个人都很爱她,所以她不能辜负他们对她的期望,她利用仅有的触觉、味觉和嗅觉来认识四周的环境,努力(充实、充满)自己,后来更进一步学习写作。几年以后,当她的第一本著作《我的一生》出版时,立即轰动了全美国。海伦·凯勒虽然五官残疾,但是她能克服不幸,完成大学教育,还从事残疾儿童教育的社会工作。这种努力上进的精神,实在值得我们学习。海伦·凯勒真可算是个残而不废的人。

1.将括号里不恰当的词划去。

2.在括号里填上合适的关联词。

(1)海伦·凯勒(  )五官残疾,(  )她能克服不幸,完成大学教育,还从事残疾儿童教育的社会工作。

(2)(  )她在一岁多的时候生病,(  )从此眼睛看不见,并且又聋又哑了。

3.为什么说海伦·凯勒“是个残而不废的人”?在文中找出相应语句,抄写在下面。

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题型:选择题

Americans are proud of their variety and individuality, yet they love and respect few things more than a uniform, whether it is the uniform of a lift operator or the uniform of a five-star general. Why are uniforms so popular in the United States?

Among the arguments for uniforms, one of the first is that in the eyes of most people they look more professional than civilian(百姓的) clothes. People have become conditioned to expect higher quality from a man who wears a uniform. The television repairman who wears a uniform is likely to inspire more trust than one who appears in civilian clothes. Faith in the skill of a garage mechanic is increased by a uniform.

What easier way is there for a nurse, a policeman, a hairdresser, or a waiter to lose professional identity(职业身份) than to step out of uniform?

Primary among the argument against uniforms in their lack of variety and the loss of individuality experienced by people who must wear them. Though there are many types of uniforms, the wearer of any particular type is generally stuck with it, without change, until retirement. When people look alike, they are likely to think ,speak, and act similarly on the job at least. Uniforms also give rise to some practical problems. Though they are long-lasting, often their initial expense is greater than the cost of civilian clothes, Some uniforms are also expensive to maintain , requiring professional dry cleaning rather than the home laundering possible with types of civilian clothes.

60  People are likely to think that a man in uniform_________.

A.  suggests quality work

B.  shows his social position

C.  appears to be more practical

D.  looks more fresh and attractive

61 Those who are against uniforms believe that people wearing uniforms_________.      

A.  are usually helpful                B.  have little freedom

C.  lose personal character             D.  enjoy greater popularity

62  It can be concluded from the passage that_________.

A.  people generally trust a person in uniform

B.people enjoy wearing comfortable uniform

C.the cost of the uniform is acceptable to people

D.people wear uniforms to show their professions

63  The underlined sentence tells us that_________.

A.  it’s impossible that people can be recognized more easily by their uniforms

B.people’s identity can be recognized more easily by their uniforms

C.nurses and policemen must wear uniforms when working

D.people in those professions act in an easier way without uniforms

题型:选择题

轮式车辆转向系为什么多采用液压动力转向系?

题型:选择题

硝态氮 nitrate nitrogen

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