Gray hair is simply a part of the normal aging process, and the rate you go silver is genetically predetermined. Going gray is not associated with earlier death, and premature graying is not, generally speaking, a sign of an illness or ill health in younger adults. There are, however, some specific health conditions associated with gray or white hair, but for most of us, going gray is just a fact of life.

Hair color comes from the pigment melanin(黑色素), which determines your individual shade. Hair without any melanin is pure white. The pigment is produced in cells called melanocytes, which inject pigment into the hair. At some point in everyone's lifetime, these cells slow down and eventually stop producing color. Scientists have yet to identify the exact mechanism by which melanocyte cell death occurs.

A study of more than 4,000 women and men from 20 countries determined that about 75% of people between the ages of 45 and 65 have some gray hair. In general, people of European descent gray earliest followed by Asians and Africans. It's interesting to note that a lucky 1 in 10 has no gray hair by retirement age. Beginning at age 30, your chances of having gray hair go up 10-20% per decade.

It may feel like you have more grays after a stressful event, but that's probably because middle age is basically a series of anxiety-ridden events. Between working, raising kids, and caring for older parents, the "sandwich" years of 45-65 can be stressful, especially for women. They are also when we naturally start to look older.

At this point, there is still no silver bullet to keep away the grays.

1.What would be the best title for this passage?

A. Going gray.                   B. Tips to make hair color last

C. Why does hair turn gray?        D. Gray hair is in fashion.

2.Which of the following is a true statement according to the passage?

A. Scientists have found out how to prevent hair from turning gray.

B. Europeans are more likely to gray than Asians and Africans.

C. Gray hair means poor health or a sign of illness.

D. Everyone will inevitably get gray hair by retirement age.

3.Which is not among the reasons for hair turning gray according to the passage?

A. Being physically weak.         B. Stress from different sides.

C. Death of melanocyte cell.       D. Genetic factors.

4.What does “silver bullet” in the last paragraph probably mean?

A. Make-up     B. Scientific research.     C. Chemical weapon.     D. Cure.

 

【答案】

 

1.C

2.B

3.A

4.D

【解析】

試題分析：本文介紹了為什么人的頭發(fā)會(huì)變白。這是自然老化的過程、與基因有關(guān)，還和黑色素的分泌的多少有關(guān)，黑色素越少，頭發(fā)越白。通過研究20多個(gè)國家的4000多男性和女性可知，有年齡原因也有地域原因。生活壓力大也是原因之一。

1.主題歸納題。根據(jù)全文尤其是文章的第一句話判斷，文章是在講頭發(fā)變白的應(yīng)用。所以選C。

2.推理判斷題。根據(jù)第三段的In general, people of European descent gray earliest followed by Asians and Africans.可知：歐洲人早于亞洲人和非洲人頭發(fā)變花白。B

3.細(xì)節(jié)理解題。根據(jù)第一段的內(nèi)容可知，銀發(fā)是一個(gè)正常老化的過程，頭發(fā)變白由基因已經(jīng)決定了的。與早亡無關(guān)，少白頭也不是生病或者身體不舒服的標(biāo)志。所以選A（身體虛弱）。

4.詞義推測題。根據(jù)最后一段的意思可知：人在45-65之間壓力很大，尤其是婦女，還有自然的老化問題。所以選D（治愈）。其他選項(xiàng)的意思是：Make-up化妝；Scientific research.科學(xué)研究；Chemical weapon.化學(xué)武器。

考點(diǎn)：科普類閱讀。

 

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