B．Well­fed mice survive better though being ill­treated.

　　C．Trained muscle produces a substance good for brain.

　　D．Regular exercise helps to clear rubbish away from body.

　　答案：D　细节理解题。由第五段最后一句话“...well­trained muscle produces an enzyme that removes harmful substances away from the body...”可知。

　　14．According to the last paragraph, the result of the study is ________.

　　A．reliable B．doubtful

　　C．predictable D．ambiguous

　　答案：A　推理判断题。该研究是在老鼠身上做的，但是它与其他研究非常吻合，所以该研究结果是可信的。

　　15．What's the main idea of the passage?

　　A．Why do you need regular exercise?

　　B．What matters most for your body?

　　C．How does exercise help your brain?

　　D．Why are mice chosen for the study?

　　答案：C　主旨大意题。由文章大意可知。

　　Feel tired lately?Has a doctor said he can’t find anything wrong with you?Perhaps he sends you to a hospital,but all the advanced equipment there shows there is nothing wrong with you.

　　Then,consider this:you might be in a state of sub-health(亚健康).

　　Sub-health,also called the third state or gray state,is explained as borderline state between health and disease.

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