题目内容

4．"Within the heart there are millions of cells （细胞） 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 本文为科教文，文章主要介绍心脏与长寿的关系．

解答 29---31 CDC
29．答案C．主旨大意题．通过全文可知，本文主要介绍心脏和长寿的关系．故选C．
30．答案D．细节理解题．根据第二段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，女性的心脏几乎不会随着年龄的增加而失去太多细胞．故选D．
31．答案C．细节理解题．根据最后一段The good news is that men can improve the health of their heart with regular exercise可知，人们可以通过锻炼来保持心脏的健康．故选C．

点评 说明文主要包括事物说明文和事理说明文，说明文一般呈现出条理清晰、逻辑严谨的特点，说明文的语言要求准确、科学．了解了这些特点，我们还要知道阅读理解的题型一般包括：细节题、语义猜测题、主旨大意题、判断推理题等．关于细节题，用到的英语说明文阅读技巧就是仔细查找．这种题型的答案一般都可以在文中找到，当然，答案不可能与原文一模一样，但是它们表达的意思是一样的．只要在文中仔细查找，就能找到答案．

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55．Weset off at dawn so that we could get to the coast before lunch time．

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