The four groups experienced a half-hour of training daily for 8, 12, 17 and 19 days, respectively．To make sure they were not just improving their test-taking skills，the researchers compared them with control groups that took the tests without the training．

　　The results, published Monday in The Proceedings of the National Academy of Sciences，were striking．Improvement in the trained groups was a lot greater．Moreover，the longer they trained, the higher their scores were．All performers，from the weakest to the strongest，showed significant improvement．

　　“Our results show you can increase your intelligence with proper training．” said Dr Jaeggi, a co-author of the paper．“No one knows how long the gains will last after training stops,” he added, “and the experiment’s design did not allow the researchers to determine whether more training would continue to produce further gains．”

　　12. The researchers thought the key to improving the intelligence was ______________．

　　A. memorizing telephone numbers

　　B. improving working memory

　　C. training in concentration

　　D. recalling a card

　　The following aspects of the training help increase intelligence EXCEPT___________．

　　A. ignoring irrelevant items

　　B. monitoring ongoing performance

　　C. managing two tasks at the same time

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