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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.

下列函数中，经过一、二、四象限的函数是（   ）

将200g20%的硝酸钾溶液与800gl0%的硝酸钾溶液混合，混合均匀后，所得溶液的溶质质量分数是（　　）