5．Does stress cause gray hair？Many people believe that tension and stress can cause your hair to lose its color．In fact，it is an old wives tale that being upset all the time can result in premature graying．Here is a closer look at this situation and why some believe that this old wives tale could be true．
As one ages，the hairs on the head also age．In fact，just about everything on the human body begins to show signs of wear and tear after a while．The joints wear and become stiff and skin wears and becomes wrinkled．Hairs on the head grow and eventually die．They are replaced，but in the process something else happens．
When new hairs are replaced，the color or pigment（色素）is also added to them．However，as one ages，this pigment becomes less and less available．At first，hairs will have a limited amount of pigment and they will appear to be grayish in color．In time，they will lose all of their pigment and will be white．Many things are known to cause graying．and genetics is a very powerful factor．If one of your parents turns gray at an early age，there is a good chance that you will too．Some people begin the graying process in high school，while others may be over the age of forty．
Constant worry and tension can have many harmful effects on the human body．It is a known fact that stressful times can cause one to suffer hair loss．It would make sense that if it can cause these problems，perhaps it also may contribute to graying．However，there，is no sound evidence to support this．
On the other hand，many medical professionals believe that there may be a link：between graying and a constant state of anxiety or，tension．Does stress cause gray hair？There is no scientific evidence to support the theory，but it is best to avoid stressful situations．
61．The underlined phrase in the first paragraph most probably meansB．
A．clever remarks B．silly remarks
C．exciting remarks D．disappointed remarks
62．The second paragraph mainly tells usD．
A．every part of body is replaced with age B．hairs will grow weak but not die
C．skin becomes wrinkled with age D．every part of body ages with age
63．What might play the most important role in the graying process？C
A．Genetics and the amount of sleeping time
B．The amount of food people eat and living environment
C．The amount of pigment and genetics
D．Genetics and the amount．of water people drink
64．According to the passage，continuous pressure may result inD．
A．a person's fatness B．a person's fitness
C．a person's weight loss D．a person's hair loss
65．From the passage we can infer thatA．
A．stress causing gray．hair is still in question
B．gray hair has nothing to do with tension．
C．stressful situations Can be of benefit．
D．sound evidence has been found．
分析 本文是一篇说明文，介绍了白发产生的原因和与人的压力、紧张情绪的关系．虽然科学上的依据还处于探索阶段，但是为了我们的健康，最好还是避免紧张压抑的消极情绪．
解答 61．B．考察对短语的理解，根据下文"Here is a closer look at this situation and why some believe that this old wives tale could be true．"，让我们来深入了解一下这种状况和为什么有的人会相信这种说法．可推理出这种说法是不正确的．而且通过全文也可知道这种说法并没有科学依据．因此应当是愚蠢的说法．故选B．
62．D．内容归纳题．注意到第二句的"everything on the human body"就可选出答案，随着年龄的增长，头发也会老化，事实上，身体的每一个部分都有老化的迹象．故选D．
63．C．细节理解题．第三段首句即提到新头发产生时就有色素pigment，随着时间过去，色素会减少．而后半段"and genetics is a very powerful factor"则说明了基因对头发变白的重要性．故选C．
64．D．细节理解题．倒数第二段"It is a known fact that stressful times can cause one to suffer hair loss"，紧张的情绪会导致脱发，故选D．
65．A．细节理解题．最后一段"There is no scientific evidence to support the theory"，说明压力会导致头发变白依旧是一个未解决的问题，故选A．
点评 本文主要考察对段意，句意的把握，只要了解文意，注意找出与题干对应的关键句子，不难得出答案．其中61题则考察了短语的理解，提醒了考生还是应注意英语学习中的语言积累．
