四、阅读理解(共15小题;每题2分，共30分。)
阅读下列短文，然后根据短文的内容从每小题的四个选择项中选出最佳的一项，并把它前面的大写字母填入左边的括弧里。
A
First there was learning. This has always been an important part of human life. By imitating their parents， children learned to hunt， to make tools， and to take care of themselves and others.
Next came education. This was possible only after people developed language. Then adults could explain how to do things. They could talk about traditions， beliefs， and ceremonies of the group. Still， education was oral. Children could learn only what their teachers could remember.
Finally， schools were created. They came into being because writing was invented. The first system for writing appeared about 3，500 B.C. in Sumeria， a land that is now Iraq. The Sumerians also invented a system for calculating with numbers. About 500 years later， the Egyptians discovered writing and calculation， too. And shortly after that， both the Sumerians and the Egyptians started schools. Being able to read and write they allowed people to learn anything that could be recorded. But the early systems were complicated. Children couldn‘t learn them just by watching. That’s why schools became a necessity.
Those first students learned reading， writing， and calculation. Having these skills gave people great power over those who did not have them. Some 5，000 years later， this is still true.
( )51. The main idea of this article is that schools ________.
A. had great power B. became necessary for learning
C. taught children to hunt D. developed language
( )52. You can decide from the article that schools have ________.
A. made education difficult B. held back learning
C. imitated parents D. advanced human skills
( )53. What happened before Egyptians discovered calculation?
A. Egyptians discovered writing. B. Egyptians started schools.
C. Sumerians invented writing. D. Sumerians started schools.
( )54. Education became possible only with the development of _______.
A. learning B. language C. calculation D. clocks