根据句意及首字母（汉语）提示，补全单词。

1.  The l_    _  _ of the Yangtze River is about 6,300 kilometers.

2.  My house is about 120 square meters in s_   _   _ .

3. The giant panda feeds on b__     __.

4.  China is one of the oldest____      （文明）in the world.

5.  The Great Wall is known as a big man-made s_     ___.

从事加工贸易生产加工的企业没有报关权，因此不需向海关办理登记手续，不需接受海关监管。 ( )