【参考答案】54—56 DBC

　　较难题目特训：科普知识类

　　The term“multitasking” originally referred to a computer’s ability to carry out several tasks at one time. For many people, multitasking has become a way of life and even a key to success. In fact, some excellent mental aerobic exercises(大脑训练)involve engaging the brain in two or more challenging activities at a time. Although checking e-mail while talking on a phone and reading the newspaper may be second nature for some people, many times multitasking can make us less productive, rather than more. And studies show that too much multitasking can lead to increased stress, anxiety and memory loss.

　　In order to multitask, the brain uses an area known as the prefrontal cortex(前额叶脑皮层). Brain seans of volunteers performing multiple tasks together show that as they shift from task to task, this front part of the brain actually takes a moment of rest between tasks. You may have experienced a prefrontal cortex“moment of rest” yourself if you’ve ever dialed(拨电话) a phone number and suddenly forgotten who you called when the line is answered. What probably occurred is that between the dialing and the answering, your mind shifted to another thought or task, and then took that“moment” to come back. Research has also shown that for many volunteers, job efficiency(效率) declines while multitasking, as compared to when they perform only one task at a time.

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