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Boys English grades are up to a tenth worse when high numbers of girls are in the class with them, though girls grades are unaffected. 当班上女生人数较多时，男生的英语成绩要下降10%，而女生们的成绩则不受影响。 Boys do worse in English when there are many girls in their class,researchers will say today, contradicting the widely held belief that girls are always a good influence on boys in school. 研究人员今天宣称，当班上女生人数较多时，男生的英语就会变得较差。而人们以往普遍认为，在学校中，女生对男生总是有积极影响。 Boys do best with as few girls as possible in English lessons at primary and secondary school, Steven Proud, a research student at Bristol Uruversity, will tell the Royal Economic Societys conference. 布里斯托大学的研究生史蒂文 普劳德将在皇家经济学会的会议上宣布：对于J,学与初中的英语课而言，女生越少，男生成绩越好。 But when it comes to maths and science, both boys and girls at primary school aclueve up to a tenth of a grade more when there is a high proportion of gids in the class, Proud found. 然而史蒂文 普劳德同时发现在数学与科学学科上，女生人数多对男女生都有积极影响_成绩可以提高10%。 | 
