| 1 | They are silkworm cocoons. | |
| 2 | The average cocoon contains about 300-400 metres of silk. | |
| 3 | The children tore the cocoon open to see if there was a pupa. | |
| 4 | Oil plants, pod and sea food also take the top place in Jiangsu. | |
| 5 | A cocoon is a kind of silk covering made by an insect. |
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