4．"Within the heart there are millions of cells （細胞） that enable it to beat．Between the age of 20and 70，one-third of those cells die and are not replaced in men，"said Goldspink．"This is part of the ageing process．"
What surprises scientists is that the female heart sees very little loss of these cells．A healthy 70-year-old woman's heart could perform almost as well as a 20-year-old one's．
"This gender difference might just explain why women live longer than men，"said Goldspink．They studied more than 250healthy men and women between the ages of 18and 80，focusing on healthy persons to remove the confusing influence of disease．"The team has yet to find why ageing takes a greater loss on the male heart，"said Goldspink．
The good news is that men can improve the health of their heart with regular exercise．Goldspink stressed that women also need regular exercise to prevent their leg muscles becoming smaller and weaker as they age．

29．The text mainly talks aboutC．
A．men's heart cells                 B．women's ageing process
C．hearts and long life               D．women's heart cells
30．According to the text，the UK scientists have known thatD．
A．women have more cells than men when they are born
B．women can replace the cells that enable the heart to beat
C．women never lose their pumping power with age
D．the female heart loses few of the cells with age
31．If you want to live longer，you shouldC．
A．enable your heart to beat much faster
B．find out the reason for ageing
C．exercise regularly to keep your heart healthy
D．prevent your cells from being lost．

分析 本文為科教文，文章主要介紹心臟與長壽的關(guān)系．

解答 29---31 CDC
29．答案C．主旨大意題．通過全文可知，本文主要介紹心臟和長壽的關(guān)系．故選C．
30．答案D．細節(jié)理解題．根據(jù)第二段What surprises scientists is that the female heart sees very little loss of these cells．A healthy 70-year-old woman's heart could perform almost as well as a 20-year-old one's可知，女性的心臟幾乎不會隨著年齡的增加而失去太多細胞．故選D．
31．答案C．細節(jié)理解題．根據(jù)最后一段The good news is that men can improve the health of their heart with regular exercise可知，人們可以通過鍛煉來保持心臟的健康．故選C．

點評 說明文主要包括事物說明文和事理說明文，說明文一般呈現(xiàn)出條理清晰、邏輯嚴謹?shù)奶攸c，說明文的語言要求準確、科學．了解了這些特點，我們還要知道閱讀理解的題型一般包括：細節(jié)題、語義猜測題、主旨大意題、判斷推理題等．關(guān)于細節(jié)題，用到的英語說明文閱讀技巧就是仔細查找．這種題型的答案一般都可以在文中找到，當然，答案不可能與原文一模一樣，但是它們表達的意思是一樣的．只要在文中仔細查找，就能找到答案．

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