4．A 推理判断题。此题判断作者的写作意图。从首段最末一句“he continues to do so in his new book The Ambiguities of Experience.”及末段“Though the book is short, it is demanding；Don’ t pick it up looking for quick, easy lessons.”可推断出本文是介绍March所著的这本书。

　　阅读理解。

　　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.

　　According to the investigation by the National Organization,over 45 percent of sub-health people are middle-aged or elderly.The percentage is even higher among people who work in management positions as well as students around exam-week.

　　Symptoms(征兆)include a lack of energy,depression,slow reactions,insomnia(失眠),agitation, and poor memory.Other symptoms include shortness of breath,sweating and aching in the waist and legs.

　　The key to preventing and recovering from sub-health,according to some medical experts,is to form good living habits, alternate work and rest, exercise regularly,and take part in open air activities.

　　As for meals,people are advised to eat less salt and sugar.They should also eat more fresh vegetables,fruits,fish because they are rich in nutritional elements?vitamins and trace elements(微量元素)—that are important to the body.

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