民族团结、民族友好一直是我国历史发展的主流。下列事件体现这一主题的是（   ）

①昭君出塞  ②文成公主和金城公主入藏  ③岳飞抗金  ④清朝册封达赖、班禅       

    It was a very foggy day in London. The fog was so 1 that it was impossible to see more than a foot. Buses, cars and taxis were not able to run and were 2 by the side of the road. People were trying to find their way on foot but were losing their way in the3.

    Mr. Smith had a very important meeting at the Houses of Commons and had to get there but no one could 4 him. He tried to walk there but found he was quite 5 Suddenly he met a stranger. The stranger 6 if he could help him.

    Mr. Smith told him where he would go. The stranger told him he would take him there. Mr. Smith thanked him and started to walk there. They talked about the annoying foggy weather on their way.

    The fog was getting thicker every minute but the stranger had no difficulty in 7the way. He went along one street, turn down another, crossed a square and then after about 8 walk, they arrived. Mr. Smith couldn't understand9 the stranger found his way. “It's wonderful,” he said. “How do you find the way in the fog?”

    “It's no 10 at all to me.” said the stranger, “I am blind.”