[填空题]How men first learnt to invent words is unknown; in other words, the origin of language is a mystery. All we really know is that men, (36) animals, somehow invented certain sounds to express thought and (37) actions and things, so that they could (38) with each other, and that later they agreed upon certain (39) , called letters, which could be (40) to represent those sounds, and which could be written down. Those sounds, whether spoken, or written in letters we call words.
The power of words, then lies in their (41) , that is, the things they bring up before our minds. Words become (42) with meaning for us by experience; and the longer we live, the more we are (43) of the glad and sad events of our past by certain words; and the longer we live, (44)
Great writers are those who not only have great thoughts but also (45) . Above all, the real poet is a master of w

How men first learnt to invent words is unknown; in other words, the origin of language is a mystery. All we really know is that men, unlike animals, somehow invented certain sound to express thoughts and feelings, actions and things, so that they could communicate with each other; and that later they agreed upon certain signs, called letters, which could be combined to represent those sounds, and which could be written down. Those sounds, whether spoken or written in letters, we call words.
The power of words, then, lies in their associations-the things they bring up before our minds. Words become filled with meaning for us by experience; and the longer we live, the more certain words recall to us the glad and sad events of our past; and the more we read and learn, the more the number of words that mean something to us increases.
Great writers are those who not only have great thoughts but also express these thoughts in words which appeal powerfully to our minds
A. a legend handed down from the past
B. a matter that is hidden secretly
C. a question difficult to answer
D. a problem not vet solved