题目内容：
第一节、阅读下面材料，根据所给的4个选项 A,B,C和D中选出最佳选项， 并在答题纸上将该选项标号涂黑。
回答题：
A
No one knows for sure when advertising first started. it is possible that it grows out of the discovery that some people did certain kinds of work better than others did them . That led the conception of specialization, which means that people would specialize.or focus on doing one special job.Let’s take a man we’ll call Mr. Fielder, for example, he did everything connected with farming. He planted seeds, tended the fields and harvest and sold his crops. At the same time, he did many other jobs on the farm. However, he didn’t make the bricks for his house, cut his rrees into boards, make the plows, or ant of the other hundreds of things a farm needs. Instead, he got them from people who specialized in doing each of those of things.
Suppose there was another man we shall call Mr. Plowright. Using what he knew about farming and working with iron, Mr. Plowright, invented a plow that made farming easier. Mr. Plowright did not really like farming himself and wanted to specialize in really good plows. Perhaps, he thought, other farmers will trade what they grow for one of my plows.
How did Mr. Plowright let people know what he was doing? Why, he advertised, of course. First, he opened a shop and then he put up a sign outside the shop to attract customers. That sign may have no more than a plow carved into a piece of wood and a simple arrow pointed to the shop door. It was probably all the information people needed to find Mr. Plowright and his really good plows.
Many historians believe that the first outdoor signs were used about five thousand years ago. Even before most people could read, they understood such signs. Shopkeepers would carve into stone, clay or wood symbols for the products they had for sale.
A medium in advertising talk is the way you communicate your message. You might sat the first medium used in advertising was signs with symbols. The second medium was audio, or sound although that term isn’t used exactly the way we used today. Originally just human voice and maybe some simple instruments, such as a bell, were used to get people’s attention.
A crier, in a historical sense, isn’t someone who seeped easily. It is someone, probably a man with a voice loud enough to be heard over the other noises of a city. In ancient Egypt, shopkeepers may hire such a person to spread the news about their products. Often these earliest forms of advertising involved a newly arrived ship loaded with goods. Perhaps the crier describes the goods, explained where they came from and praised their quality. His job was, in other words, not too different from a TV or radio commercial in today’s world.
what probably led the start of advertising? A．the discovery of iron
B．the specialization of labor
C．the appearance of new jobs
D．the development of farm techniques
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