求英语高手帮我做一道英语的阅读理解.并注明解释.

求英语高手帮我做一道英语的阅读理解.并注明解释.
How men first learned to invent words,the origin of language,is a mystery.What we really know is that men,unlike animals,invented certain sounds to express thoughts and feelings,actions and things,so that they could communicate with each other,and later they agreed on certain signs.These signs were called letters,which could be combined to represent those sounds and could be written down.Those sounds,whether spoken or written in letters,are called words.
The power of words,then,exists in their associations—the things they bring up before our minds.Words become filled with meanings for us by experience,and the longer we live,the more certain words remind us of the glad and sad events of our past,and the more we read and learn,the more the number of words increases.
Great writers are those who not only have great thoughts but also express these thoughts in words which deeply attract our minds and emotions.This skillful use of words is called “literary style”.Above all,a real poet can express his meaning in words which sing like music and can move men to tears.We should,therefore,learn to choose our words carefully and use them properly,or they will make our speech silly and vulgar.
1.The origin of language is ____.
A.treasure handed down from the past B.a matter that is hidden or secret
C.a question impossible to answer D.no longer a problem to be solved
2.One reason why men invented certain sounds to express thoughts and actions was that __.
A.they could agree on certain signs B.they could write them down
C.they could communicate with one another D.they could combine them
3.Which of the following is true about words?
A.They are used to express feelings only.
B.They cannot be used correctly by most people.
C.They are simply sounds and can be written down.
D.They cannot be used to express thoughts.
4.The real power of words exists in their ____.
A.properties B.convenience C.invention D .representative function
5.In expressing their thoughts,great poets are able to ____.
A.inspire people to action B.move people to tears
C.drive people to succeed D.urge people to fight