1. Why are some mental aerobic exercises designed to engage people in multitasking?

　　A. To make them more productive.

　　B. To reduce their stress and anxiety.

　　C. To develop their communication skills.

　　D. To help them perform daily tasks more easily.

　　2. According to Paragraph 2, why may a person suddenly forget who he has called?

　　A. He may have his prefrontal cortex temporarily damaged.

　　B. He is probably interrupted by another task.

　　C. He is probably not very familiar with the person he has called.

　　D. He may need a rest between dialing and speaking.

　　3. People tend to make mistakes when　.　

　　A. they perform several challenging tasks at a time

　　B. new messages are processed one after another

　　C. their relationships with others are affected

　　D. the tasks require little thought

　　4. What is the main idea of the passage?

　　A. Multitasking has become a way of life.

　　B. Multitasking often leads to efficiency decline.

　　C. Multitasking exercises need to be improved.

　　D. Multitasking enables people to remember things better.

　　【参考答案】1--4 、ABAB

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