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
【R37】
选项
答案B
解析 文章提到，戈登-利思戈使用一种抗衰老的化学物质成功将一种蚯蚓(earthworms)的寿命延长了50％，故填上B。注意试题中的increase the lifespan of．．．by 50 per cent和原文中的the life of．．．was extended by half是同义表达。
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