根据以下材料，回答下面试题
　　Earlier this month,researcher Kevin Beaver of Florida State University reported that he and hisco-authors had identified genetic markers associated with academic achievement.In their study, published in the journal Developmental Psychology, thescientists found that young people who possessed particular forms of threegenes were more likely to finish high school and go on to college than thosewho carried other forms of the genes.The newly found genes are involved inregulating the actions in the brain, and have been linked in other studies tolevels of motivation, attention and intelligence.
　　It is true that in recent years, scientists have produced a growing number of studies linking the capacity to learn to specific genes.A team at King's College London,for example, has published several articles relating ability in mathematics to different varieties in DNA. Children who carried 10 or more of the" risk" genes identified by the researchers were nearly twice as likely to perform poorly in math,according to a 2010 study generated by the group.In another experiment, scientists reported that some individuals possess another two forms of genes involved in brain development that may make it easier for them to learn difficult languages like Chinese.
　　But scientists have long warned against attributing complex human behaviors to the action of a few genes -- and learning is among the most complex things we do.The authors of these studies acknowledge this."Mathematical ability and disability are influenced by many forms of genes generating small effects across the entire system of ability," writes Sophia Docherty,who heads the King's College team. Moreover, environment matters, even in the context of genes: Docherty's research finds that children with the" risk" forms of genes were especially likely to do poorly in math when they lived inchaotic homes and had negative,punitive(惩罚性的 )parents.More generally research in dicates that genetic factors account for about half of the elements in educational achievement.
　　第26题　Scientists found that___.
　　A.everyone is born the same in the ability of learning
　　B.genes can not affect people's performance in learning
　　C.there are some genes which make people learn better
　　D.genes are decisive factors for learning better
　　第27题　Some children performpoorly in mathematics probably because___.
　　A.they don't have goodgenes for learning mathematics
　　B.they have laid a weakfoundation in learning mathematics
　　C.their parents neglectedthe child's early education in mathematics
　　D.their mathematics programs are too difficult for them
　　第28题　Scientists also found that___.
　　A.some individuals possess completely different forms of genes
　　B.some people are born with talent in learning language
　　C.learning behaviors are complex to attribute the roles of genes
　　D.mathematics is the most complex human brain action
　　第29题　The word" chaotic" probably means___.
　　A.lower educated　B.in complete disorder and confusion　C.looking after children poorly　D.not in harmony
　　第30题　We can concludethat___.
　　A.environment matters are even more important in learning
　　B.more practice can make up the difference of genes
　　C.some people can never learn well no matter how hard they do
　　D.some one is born brighter than others

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