D.the cause of the changes has not been determined

　　4.What is the passage mainly about?

　　A.It is not yet decided whether music is good for intelligence.

　　B.Music lessons in early childhood may improve brain’s performance.

　　C.A scientific experiment has been finished in Beijing Normal University.

　　D.The earlier you take children to musical training,the brighter they’ll be.

　　B

　　A tone-deaf(不会辨别音调的)teenager who suffered a concussion(脑震荡) has astonished his family by suddenly being able to play music effortlessly.Lachlan Connors,a high school junior from Denver,Colorado,now plays 13 instruments,even though he has never learned to read music.But he didn’t always have such a talent.As a younger student he loved sport,dreamed of a career playing lacrosse(长曲棍球) and had no passion for music.

　　“He really had no talent,”his mother told CBS.“I would say,‘Can’t you hear what’s next?’with something like ‘Twinkle,Twinkle Little Star’ and he’d say ‘No’.When he was in the sixth grade,he was playing lacrosse when he fell backwards and knocked the back of his head against the ground,suffering a concussion.”

　　“I remember getting up and feeling dazed,”he told CBS.“I didn’t realize something bad had happened.”The doctors told him he could return to the field,but he went on to suffer another couple of hard hits to the head,which sent him to hospital.As his condition worsened,doctors told him he should not play contact sports any more,but there was one strange good side effect:his newly-found musical talent.He can now play 13 instruments,including piano,guitar,mandolin,harmonica and bagpipes.“Music is the thing that gets me up every morning,”he said.His doctor,Spyridon Papadopoulos,said that the concussions switched on part of Lachlan’s brain that had previously been dormant.

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