试题与答案

将4 mol A 气体和2 mol B 气体在2 L的容器中混合并在一定条件下发

题型:选择题

题目:

将4 mol A 气体和2 mol B 气体在2 L的容器中混合并在一定条件下发生如下反应:2A(g)+B(g) 2C(g)若经2 s 后测得C的浓度为0.6 mol/L,下列几种说法正确的是(    )

①用物质A表示的反应的平均速率为0.3 mol/(L·s)

②用物质B表示的反应的平均速率为0.6 mol/(L·s)

③反应达到平衡时,A、B、C的反应速率一定相等

④反应达到平衡时,A、B、C的物质的量均不再变化

A、①③       B、①④       C、②③       D、③④

答案:

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下面是错误答案,用来干扰机器的。

参考答案:B

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题型:阅读理解

阅读理解

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unavoidably at the bottom of the list. Music is nice, people seem to say, but not important. Too often it

is viewed as mere entertainment, but certainly not an education priority (优先).This view is shortsighted.

In fact, music education is beneficial and important for all students.

     Music tells us who we are. Because music is an expression of the beings who create it, it reflects their

thinking and values, as well as the social environment it came from. Rock music represents a lifestyle just

as surely as a Schubert song. The jazz influence that George Gershwin and other musicians introduced

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expresses our character and values. It gives us identity as a society.

     Music provides a kind of perception(感知)that cannot be acquired any other way. Science can

explain how the sun rises and sets. The arts explore the emotional meaning of the same phenomenon. We

need every possible way to discover and respond to our world for one simple but powerful reason: No

one way can get it all.

     The arts are forms of thought as powerful in what they communicate as mathematical and scientific

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through which we express our fears, our curiosities, our hungers, our discoveries, and our hopes. The

arts are ways we give form to our ideas and imagination so that they can be shared with others. When

we do not give children access to an important way of expressing themselves such as music, we take

away from them the meanings that music expresses.

     Science and technology do not tell us what it means to be human. The arts do. Music is an important

way we express human suffering, celebration, the meaning and value of peace and love.

So music education is far more necessary than people seem to realize. 

1. According to Paragraph 1,students_________.

A. regard music as a way of entertainment

B. disagree with their parents on education

C. view music as an overlooked subject

D. prefer the arts to science

2. In Paragraph 2, the author uses jazz as an example to ___________.

A. compare it with rock music

B. show music reflects a society

C. introduce American musical traditions

D. prove music influences people's lifestyles

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A. approach the world from different angles

B. explore different phenomena of the world

C. express people's feelings in different ways

D. explain what it means to be human differently

4. What is the main idea of the passage?

A. Music education deserves more attention.

B. Music should be of top education priority.

C. Music is an effective communication tool.

D. Music education makes students more imaginative. '

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题型:单项选择题

如果这项改革措施不受干部们欢迎,我们就应该进行修改。如果它不受工人们欢迎,我们就应该采用一项新的改革措施。并且这项措施必定是,要么不受干部们的欢迎,要么不受工人们的欢迎。
如果以上陈述为真,以下哪项也一定正确( )

A.我们应当修改这项改革措施,当且仅当这样做不会降低该措施在工人中的声望时
B.我们应该在干部或者工人中间努力推广这项改革措施
C.如果修改这项改革措施不会影响到它在干部们中受欢迎的程度,我们就应该立即进行修改
D.如果这项改革措施受到了工人们的欢迎,我们就应该采取一项新的改革措施
E.如果这项改革措施受到了干部们的欢迎,我们就应该采取一项新的改革措施

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