帮我检查一下这个长句有无结构的错误,其他语法错误及词的用法也顺便指出.写作文想加入长短句的变化.
刚开始练,可能错误还不少.分不多,您辛苦了
The result of a survey among teenagers in Shanghai which designed by Shanghai phisical science research institution states that 66% teenagers below the average height and IQ level after eat a lot of junk food,approves that junk food can damage our health.
能优化的结构顺便也优化一下,我会加分的.