hello,

You didn't mention from which book this question is but i suppose it is from class 12th English book Flamingo. The Chapter is LAST LESSON written by Alphonse Daudet.

The two points which show to that the people of Alsace loved their language  are

1. M.Hamel Declared that French was the most beautiful language of the world. It was clearest and most logical of all languages. He asked the people to guard it among themselves and never forget it. As long as people ' hold fast of their language' they have the key to their freedom.
2. The order from Berlin has come, that all the schools of Alsace will be teaching German instead of French and this was their last French Class. All the village elders attended the last french class.Everyone was quiet and sad. They didn't enjoyed learning french but the order from Berlin changed everything for them. It aroused patriotic feeling in them. At the end of this class they all said " Vive La France !" which means long live France

Hope this was helpful.