【答案解析】[听力原文] How did the first people on earth communicate with each other? They didn't talk to each other. They didn't use words at all. They probably used signs or pointed to things that they wanted. Nobody knows for certain when people first began to use words, but ac cording to some scientists language may be about one million years old. What were the first words in the human vocabulary? They probably named things that were common and important. Perhaps their first words were short, simple sounds for things that they saw or touched such as the sun, the moon, a tree, a stone, rain, or water. Words for basic human emotions such as love, dislike, fear, and pain were probably part of the earliest vocabulary. Early human beings talked long before they developed a system of writing. The invention of the alphabet made it easier to communicate information to a greater number of people. Ideas were carried from one land to another. The people of the ancient world had discovered a new tool for knowledge.