三、 阅读理解（本大题共10小题，每小题2分，共20分）
阅读下面的短文，从A、B、C、D四个选项中选出一个最佳答案填空或答题，错选、多选或未选均无分。
Passage 1
If we were asked exactly what we were doing a year ago， we should probably have to say that we could not remember. But if we had kept a book and had written in it an account of what we did each day， we should be able to give an answer to the question.
It is the same in history. Many things have been forgotten because we do not have any written account of them. Sometimes men did keep a record of the most important happenings in their country， but often it was destroyed by fire or in a war. Sometimes there was never any written record at all because the people of that time and place did not know how to write. For example， we know a good deal about the people who lived in China 4，000 years ago， because they could write and leave written records for those who lived after them. But we know almost nothing about the people who lived even 200 years ago in central Africa， because they had not learned to write.
Sometimes， of course， even if the people cannot write， they may know something of the past. For most people are proud to tell what their fathers did in the past. This we may call “remembered history”。 Some of it has now been written down. It is not so exact or so valuable to us as written history is， because words are much more easily changed when used again and again in speech than when copied in writing. But where there are no written records， such spoken stories are often very helpful.
31. Why do we know very little about the central Africa 200 years ago？
A. Because there was nothing worth being written down at that time.
B. Because the people there ignored the importance of keeping a record.
C. Because the written records were perhaps destroyed by a fire.
D. Because the people there had not known how to write.
32. “Remembered history” refers to ______.
A. history based on a person‘s imagination
B. stories of important happenings passed down from mouth to mouth
C. songs and dances about the most important events
D. both B and C
33. It can be inferred from the passage that we could have learned much more about our past than we do now if our ancestors had ______.
A. kept a written record of every past event
B. not burnt their written records in wars
C. told exact stories of the most important happenings
D. made more songs and dances
