血液在何处与组织细胞进行物质交换？（    ）

A

When I drove to work yesterday, I met a traffic jam（交通阻塞）.As I looked out of my window, a young man was walking on the street. He was walking to the bridge. There were some homeless men with their cups around there. The young man went to one of them. He brought out some money, said a few words to him and put the money into his cup. He continued（继续）to walk and then saw another homeless man. He stopped for a minute, said a few words and then gave the man a candy.

And then he saw the next homeless man. He was shivering（冷得发抖）because of coldness. The young man now stopped and gave his scarf to him. He then said goodbye to him with a big smile and went away in the snow.

At that moment, I was in tears（流泪）.I gave this young man my best wishes with love and blessings.

英国媒体说,全世界现有大约4 300个经济特区,最突出的莫过于中国香港附近的那一个,后来被称为“深圳奇迹”。“深圳奇迹”始

于　(　　)

2015年9月3日，是中国人民抗日战争暨世界反法西斯战争胜利70周年纪念日，我国在天安门广场举行了盛大的阅兵式，全国亿万观众收看了纪念活动的整个过程，不少观众激动得热泪盈眶，对祖国的强大表示万分的自豪和骄傲。对此认识错误的是（   ）