Shenzhen is a city in South China．It is not very big, but it has attracted people of the whole country and the whole world as well．

    Just about thirty years ago, it was only a small fishing village．There were not many people there． Most of them lived on fishing．Things have greatly changed since the 1980s．It became the first special economic zone(经济特区) in China．

    Because of the opening policy(政策), economic changes between China and the outside world have increased greatly．People can come and go easily between Shenzhen and Hong Kong．Both foreigners and Chinese have built a lot of factories, companies and tourists' attractions there．People all over the country have come to find jobs．Many of them have settled down in this new booming(兴起的) city．

    Shenzhen has been developing so fast that it has become a well－known metropolis(大都市) in China．

下面是明长城示意图。明长城的起止点为（    ）

2016气9月3日，二十国集团（G20）工商峰会在杭州举行。在这次峰会上，我们首次全面阐释我国“全球经济治理观，首次把创新作为核心成果，首次把发展议题置于全球宏观政策协调的突出位置，首次形成全球多边投资规则框架，首次发布气候变化问题主席声明，首次把绿色金融列入二十国集团议程，在二十国集团发展史上留下了深刻的中国印记。

请结合所学知识，说明中国在二十国集团发展史上留下深刻印记的原因。

2016年1月，丽水九龙国家湿地公园通过验收，成为丽水市首个“国家湿地公园”，公园内有丰富的野生动、植物资源，已知有84种鱼类，有白鹭、苍鹭、白鹅等鸟类，还有哺乳类、爬行类、两栖类等．