A．People wish to become much smarter.

　　B．People believe it is scientific.

　　C．People know nothing about the brain.

　　D．People want to make little use of their brain.

　　答案：A　细节理解题。根据第一段“...if it were true, then we could instantly become ten times more intelligent just by firing up that sleepy majority of the brain！”可知。

　　6．What did scientists discover in their experiment in the 20th century?

　　A．The majority of the brain is sleeping.

　　B．Animals' legs and tails have some connection with their brain.

　　C．Stimulation on some parts of the brain causes no physical reaction.

　　D．Certain parts of the brain are devoted to language and learning activities.

　　答案：C　细节理解题。根据第三段第一句可知答案。

　　7．“Silent cortex” has proved to be ________.

　　A．sensitive to stimulation

　　B．useful in complex activities

　　C．responsible for physical reaction

　　D．more active than the other parts of the brain

　　答案：B　词义猜测题。根据第三段“Today we know that in humans, much of the ‘silent cortex’ is actually devoted to complex activities”可知。

　　8．If you need less brain activity to perform a task, ________.

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