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                           Amount of Electricity Used

This graph show the amount(数量) of electricity used in a small city. It is clear that the city uses more electricity in____  than in ____ . In summer, people use the most electricity at 12 p.m. This is probably ____ the high temperature at noon. In winter, people use the most electricity at____  The graph also shows the amount of electricity used ____ from 6 a.m. to 12 p.m. The amount of electricity use decreases (减少)from 6 p.m. to 12 a.m.

在中国的许多农村乡镇地区，有每逢二、五、八日（或一、四、七日，三、六、九日）到当地的中心集镇赶集交易（也称赶场）的习俗，这种“赶集之风”至少应追溯到（    ）