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_________________73_____.The air seemed thin, as though its combination of gases had little oxygen left. Hit by a lack of fresh air, my head ached. Just as I tried to make the necessary adjustment to this new situation, Wang Ping appeared. He handed a mask to me and I felt better in no time._____________ __ __ 74 .These carriages float above the ground and by bending or pressing down in your seat, you can move swiftly. Wang Ping fastened my safety belt and showed me how to use it. Soon I could fly as fast as him. _ 75 . He was swept up into the centre of them. Just at that moment I had a "time lag" flashback and saw the area again as it had been in the year AD 2008.