China has stop all exchanges on 10/31. The price you saw are the last history price.
Some of the other chinese exchanges are still operating i think? is this because China has only shut down a few of the exchanges, and this is one of them?
No. Only P2P trading is currently available in mainland China until further notice from PBoC and the government is released. Give it 1-2 months from now and surely China will reconsider lifting the ban on cryptocurrency exchanges. There aren't any official sources about this but apparently the Chinese officials are notoriously known for their unsure stance about bitcoin.
They also don't want to miss getting those taxes from these exchanges knowing that a there's also a large market/volume coming from China.