2. 外语
  3. Complete the summary using the list of words, A-H, below. Write the correct letters, A-H, in boxes 37-40 on your answer sheet. S

Complete the summary using the list of words, A-H, below. Write the correct letters, A-H, in boxes 37-40 on your answer sheet. S

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问题 Complete the summary using the list of words, A-H, below.
Write the correct letters, A-H, in boxes 37-40 on your answer sheet.
Scientific Progress towards Extending Life Expectancy
In one experiment using anti -ageing chemicals, the life of 【R37】______ was extended by half. Besides, 【R38】______ like the ones which control the ageing process in these animals have also been found in other species. Unfortunately, however, experiments on 【R39】______ have been less successful: while they live longer, the 【R40】______ controlling their growth are also affected with the result that they grow less.
A chemicals B earthworms C fruit flies D genes
E hormones F human beings G mice H organisms
【R39】
选项
答案G
解析 文章在第五段提到另外一个在老鼠身上做的实验，结果令人忧虑(alarming results)，指出这些基因也会控制操纵生长发育的荷尔蒙(hormones)，虽然使得突变老鼠(mutant mice)的寿命延长了，但其体型却变小了。故39题答案为G，40题答案为E。
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