Sophie bought vegetables, picked up newspapers, and cooked for the old man Sam every day. Sam told Sophie a lot of stories every day. One day, Sophie went to Sam's house, but nobody answered the door. Where had Sam gone?
“Smart Cat" has the following sixfeatures: Feature one: original stories, readable. Feature two: audio stories, diverseversions. Feature three: outline closely, highcoverage. Feature four: scientific choreography, high repetitionrate. Feature five: rich resources both onlineand offline. Feature six:reading guidance, high practicability.
