However, before starting the test, two of the groups were subjected to a 20­minute session of a light electric current to the parietal lobe, which the scientists believe is the brain's number cruncher (能迅速运算者). For the first group the current flow was passed right to left, while for the second it was transmitted left to right. The third group received no help at all.

　　The group that got zapped right to left seemed to show an amazing improvement in their math skills. However, the ones that got zapped left to right were reduced to the level of almost six­year olds! The results for the people who got no help were somewhere in between.

　　While scientists are not sure why the direction of the current would make such a difference, they believe that zapping it from the right side, seemed to turn up the activity of the brain cells to math, while going the other way turned or closed them down. Luckily, the impact is expected to last for only six months!

　　While this is great news, do not fire your math tutor yet. That's because the research, no matter how successful, is not being done to aid lazy students, but to help people who suffer from dyscalculia (计算障碍), a disease which makes people unable to cope with simple day­to­day numerical issues, like counting change or figuring out their expenses.

9．In which time order was the experiment carried out?

　　a．Divide the students into groups.

　　b．Test the students with problems.

　　c．Give some students some electric zapping.

　　A．a，b，c B．a，c，b

　　C．b，a，c D．c，a，b

10．From the passage, we can infer that ________．

　　A．the direction of zapping the brain is very important

　　B．the impact of zapping the brain will last forever

　　C．scientists don't know how to zap the brain correctly

　　D．people with dyscalculia can't recognize numbers

11．What is the aim of the experiment?

　　A．To help students to improve their math grades.

　　B．To test which part of the brain controls calculation.

　　C．To help people who suffer from a certain disability.

　　D．To study whether a light electric current will damage students' brain.

12．What would be the best title for the passage?

A．Dyscalculia is no longer a problem