听力原文：How people first learned to invent words is unknown; in other words, the origin o

听力原文： How people first learned to invent words is unknown; in other words, the origin of language is a mystery. All we really know is that people, unlike animals, somehow invented certain sounds to express thoughts and feelings, 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 meanings 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 those thoughts in words which appeal to our minds and emotions. This charming use of words is what we call literary style. Above all, the real poet is a master of words. He can convey his meaning in words which sing like music, and which by their position and association can move men to tears. We should therefore learn to choose our words carefully and use them accurately, or they will make our speech silly and vulgar.

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A．The origin of language is a legend handed down from the past.

B．The origin of language is a matter that is hidden or secret.

C．The origin of language is a question difficult to answer.

D．The origin of language is a problem not yet solved.