参考答案：

    The Norman Conquest of 1066 is perhaps the best-known event in English history. William the Conqueror confiscated almost all the land and gave it to his Norman followers. He replaced the weak Saxon rule with a strong Norman government.

1. The feudal system was completely established in England.

2 .There was a much stronger control over the country by the Romanbacked Catholic Church..

3. French gradually became the official language.

4. There were numerous contacts between England and France.