14 The average modified mouse lived

　　A 3 years.

　　B 753 days.

　　C More than 3 years.

　　D 887 days.

　　15 What can be inferred from the passage about the route to long life?

　　A It remains to be studied.

　　B It has already been discovered.

　　C Eating more leads to long life.

　　D Eating less leads to long life.

　　答案：11. C 12. B 13. A 14. D 15. A

　　解析：

　　11. C 細節題，這里的定位詞可以是Ronald Kahn and his colleagues和mice，在原文中找到 Ronald Kahn at Harvard Medical School in Boston， US， and his colleagues have been able to extend the lifespan (壽命) of mice by 18 per cent by blocking the rodents (嚙齒動物) increase of fat in specific cells.其中extend the lifespan (壽命) of mice是延長老鼠壽命的意思。這里的by blocking the rodents...是by引導的方式狀語從句。答案就在此。這里的fat in specific cells恰好對應了選項C的specific genes in their fat cells.

　　12. B 細節題，關于human的敘述在Whether this works in humans is still unknown， partly because few people are willing to submit to such a strict diet.所以選B.

　　13. A 推斷題，因為這里有imply暗示。在原文中找到相應句子，"These mice eat all they want， lose weight and live longer. Its like heaven."這句話沒有生詞，我們可以將其翻譯出來：這些老鼠們吃他們想吃的，還減肥并且還長壽，這簡直就是天堂！將選項都可以翻譯出來，發現只有A 合適。這句話言外之意就是人們減肥但是又不想少吃。所以mice的這種情況被認為是天堂。

　　14. D 細節題，關鍵詞是average modified mouse，在原文找到The average control mouse lived 753 days， while the thin rodents averaged a lifespan of 887 days.這里的改良的mouse就是指比較瘦的，所以這里選887days

　　15. A 推斷題，關于走向長壽的路徑，屬于總結性的意思，在最后一段話中It might be the same effect or there might be two routes to long life，" he points out， "and that would be very interesting."這里作者都與effect和routes都用了might一詞，說明還不確定這種效果能不能在人身上體現，所以選項A有待研究比較符合題意。