C8 [2017·北京卷] ----D

　　Multitasking

　　People who multitask all the time may be the worst at doing two things at once, a new research suggests. The findings, based on performances and self－evaluations by about 275 college students, indicate that many people multitask not out of a desire to increase productivity, but because they are easily distracted (分心) and can't focus on one activity. And “those people turn out to be the worst at handling different things，” said David Sanbonmatsu, a psychologist at the University of Utah.

　　Sanbonmatsu and his colleagues gave the students a set of tests and asked them to report how often they multitasked, how good they thought they were at it, and how sensation－seeking (寻求刺激) or impulsive (冲动) they were. They then evaluated the participants' multitasking ability with a tricky mental task that required the students to do simple mathematical calculations while remembering a set of letters.

　　Not surprisingly, the scientists said, most people thought they were better than average at multitasking, and those who thought they were better at it were more likely to report using a cellphone while driving or viewing multiple kinds of media at once. But those who frequently deal with many things at the same time were found to perform the worst at the actual multitasking test. They also were more likely to admit to sensation－seeking and impulsive behavior, which connects with how easily people get bored and distracted.

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