“People multitask not because it's going to lead to greater productivity, but because they're distractible, and they get sucked into things that are not as important，” Sanbonmatsu said.

　　Adam Gazzaley, a researcher at the University of California, San Francisco, who was not a member of the research group, said one limitation of the study was that it couldn't find out whether people who start out less focused tend toward multitasking or whether people's recognizing and understanding abilities change as a result of multitasking.

　　The findings do suggest, however, why the sensation－seekers who multitask the most may enjoy risky distracted driving. “People who are multitasking are generally less sensitive to risky situations，” said Paul Atchley, another researcher not in the group. “This may partly explain why people go in for these situations even though they're dangerous.”

　　67. The research led by Sanbonmatsu indicates that people who multitask

　　________．

　　A. seek high productivity constantly

　　B. prefer handling different things when getting bored

　　C. are more focused when doing many things at a time

　　D. have the poorest results in doing various things at the same time

　　68．When Sanbonmatsu and his colleagues conducted their research, they

　　________．

　　A. assessed the multitasking ability of the students

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