18.A healthy amount of sunshine may be the secret to staying young.British scientists have discovered.
Vitamin D is produced naturally by the skin in response to(對…的反應(yīng)) sunlight and may help to slow the ageing process and protect against heart disease,according to the study.
Researchers from King's College London studied 2,160women aged between 18and 79,looking at their telomeres---a biological marker of ageing found in DNA.As people get older,their telomeres get shorter and they become more susceptible(易受傷害的) to certain illnesses.
But the study found women with high levels of vitamin D had comparatively longer telomeres---a sign of being biologically younger and healthier.
The study suggests vitamin D may help to slow down the ageing(變老,老化) process of DNA,and therefore the ageing process as a whole.
Lead researcher Dr Brent Richards said,"These results are exciting because they show for the first time that people who have higher levels of vitamin D may age more slowly than people with lower levels of vitamin D."This could help to explain how vitamin D has a protective effect on many ageing related diseases,such as heart disease and cancer."
Professor Tim Spector,a co-author of the report,added,"Although it might sound absurd(荒唐的),it's possible that the same sunshine which may increase our risk of skin cancer may also have a healthy effect on the general ageing process.
Vitamin D made by the action of sunlight on the skin accounts for 90percent of the body's supply,but lower levels can also be got through food such as fish,eggs and breakfast cereals(粥).
Other studies have suggested the vitamin plays a key role in protecting against cancer and heart disease.
25.A certain amount of sunshine helps people stay young becauseD.
A.people feel happy and energetic in the sun
B.sunshine protects people against heart disease
C.vitamin D makes one's skin look young and healthy
D.vitamin D may help to slow the ageing process.
26.From Brent Richards,we know thatD.
A.sunlight causes skin cancer to people with high level of vitamin D
B.the study generally has a healthy effect on the general ageing process
C.vitamin D can only be got from fish,eggs and breakfast cereals
D.the higher levels of vitamin D people have,the more slowly people may age
27.What can we infer from the passage?C
A.Telomeres are important as they are signs of ageing of the DNA.
B.Sunlight can be dangerous as it causes skin cancer.
C.Sunlight does more good than harm to our health.
D.Vitamin D can also be gained from food.
28.What is the best title of the passage?B
A.Secret of Staying Young
B.Vitamin D Helps Slow Ageing
C.Sunlight and Vitamin D
D.Sunlight and Health.
分析 本文主要講的是研究表明太陽光產(chǎn)生的維他命D能夠延緩衰老,從而使人保持年輕.
解答 25-28.DDCB
25題答案:D 考查細節(jié)推理,根據(jù)文章第二段的Vitamin D is produced naturally by the skin in response to(對…的反應(yīng)) sunlight and may help to slow the ageing process and protect against heart disease(作為對陽光的自然反應(yīng)而產(chǎn)生的維他命D可能有助于減緩老化過程以及保護我們抵抗心臟。┛芍绢}答案為D選項.
26題答案:D 考查細節(jié)推理,根據(jù)文章第六段的These results are exciting because they show for the first time that people who have higher levels of vitamin D may age more slowly than people with lower levels of vitamin D(這些結(jié)果很令人興奮,因為它們首次展示了維他命D水平更高的人可能比維他命水平D更低的人老化緩慢)可知本題答案為D選項.
27題答案:C 考查細節(jié)推理,文章主要講的是太陽光產(chǎn)生的維他命D能夠延緩老化,并且在與老化相關(guān)的疾。ㄈ缧呐K病與癌癥)方面有保護性作用;雖然太陽光也有可能導(dǎo)致我們皮膚癌的風(fēng)險,但是很明顯其利要大于弊.而且文章也有很多地方強調(diào)了太陽光的好處,如倒數(shù)第四段This could help to explain how vitamin D has a protective effect on many ageing related diseases,such as heart disease and cancer(這有助于解釋維他命D是如何在很多與老化相關(guān)的疾。ㄈ缧呐K病與癌癥)方面起到保護性作用的)、倒數(shù)第三段Although it might sound absurd(荒唐的),it's possible that the same sunshine which may increase our risk of skin cancer may also have a healthy effect on the general ageing process(盡管聽起來荒唐,有可能增加我們皮膚癌風(fēng)險的太陽光也有可能對于整體的老化過程有健康的作用)以及最后一段Other studies have suggested the vitamin plays a key role in protecting against cancer and heart disease(其他的研究表明維他命在保護預(yù)防癌癥與心臟病方面起到關(guān)鍵作用),這些都說明太陽光的利要大于弊.注意D選項不是推遲,而是已經(jīng)給出的文章事實.
28題答案:B 考查文章標題,本文主要講的是研究表明太陽光產(chǎn)生的維他命D能夠延緩衰老,從而使人保持年輕.故本題答案為B選項,其余選項概括都不準確.
點評 本文是一篇健康環(huán)保類閱讀,題目涉及多道細節(jié)理解題,做題時結(jié)合原文和題目有針對性找出相關(guān)語句進行仔細分析,結(jié)合選項選出正確答案.推理判斷也是要在抓住關(guān)鍵句子的基礎(chǔ)上合理的分析才能得出正確的答案.