问题
填空题
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_ ___.
答案
1. length 2. size 3. bamboos 4. civilization 5. structure