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．a(chǎn)nd 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(chǎn) person's fatness B．a(chǎn) person's fitness
C．a(chǎn) person's weight loss D．a(chǎn) 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 本文是一篇說明文，介紹了白發(fā)產(chǎn)生的原因和與人的壓力、緊張情緒的關(guān)系．雖然科學(xué)上的依據(jù)還處于探索階段，但是為了我們的健康，最好還是避免緊張壓抑的消極情緒．
解答 61．B．考察對(duì)短語的理解，根據(jù)下文"Here is a closer look at this situation and why some believe that this old wives tale could be true．"，讓我們來深入了解一下這種狀況和為什么有的人會(huì)相信這種說法．可推理出這種說法是不正確的．而且通過全文也可知道這種說法并沒有科學(xué)依據(jù)．因此應(yīng)當(dāng)是愚蠢的說法．故選B．
62．D．內(nèi)容歸納題．注意到第二句的"everything on the human body"就可選出答案，隨著年齡的增長(zhǎng)，頭發(fā)也會(huì)老化，事實(shí)上，身體的每一個(gè)部分都有老化的跡象．故選D．
63．C．細(xì)節(jié)理解題．第三段首句即提到新頭發(fā)產(chǎn)生時(shí)就有色素pigment，隨著時(shí)間過去，色素會(huì)減少．而后半段"and genetics is a very powerful factor"則說明了基因?qū)︻^發(fā)變白的重要性．故選C．
64．D．細(xì)節(jié)理解題．倒數(shù)第二段"It is a known fact that stressful times can cause one to suffer hair loss"，緊張的情緒會(huì)導(dǎo)致脫發(fā)，故選D．
65．A．細(xì)節(jié)理解題．最后一段"There is no scientific evidence to support the theory"，說明壓力會(huì)導(dǎo)致頭發(fā)變白依舊是一個(gè)未解決的問題，故選A．
點(diǎn)評(píng) 本文主要考察對(duì)段意，句意的把握，只要了解文意，注意找出與題干對(duì)應(yīng)的關(guān)鍵句子，不難得出答案．其中61題則考察了短語的理解，提醒了考生還是應(yīng)注意英語學(xué)習(xí)中的語言積累．
