题目内容：
{MP3:http://down.233.com/2012/listenfiles/xdftl/Test7.mp3}One of the genes that protects us from cancer may also help delay aging, according to a new study.
The findings could also one day lead to new drugs that prevent or fight cancer while (36) healthy youth and life span, said Manuel Serrano, a researcher at the Spanish National Cancer Research Centre, who worked on the study.
Serrano said researchers (37) engineered mice to have an extra copy of a key cancer-fighting gene called p53 and found it also played an important role in delaying aging.
"Everyone agrees that the aging is produced by the (38) of faulty cells, " Serrano said. "In other words, p53 delays aging for exactly the same reason that it prevents cancer. "
(39) cancer studies have shown that p53 can actually cause (40) aging symptoms by killing too many cells when it goes into (41) , but Serrano said his research strictly (42)
the gene so that it turned on only when needed.
The gene did their (43) job of producing a protein that kills damaged cancer cells. But the researchers found that mice with an extra copy of the genes (44)"This is the first anti-cancer gene tested for its effect on aging, " Serrano said. "The mice lived 16 percent longer in their average life span. "
The p53 gene, when working properly, (45)
If the gene is mutated or inactivated the control mechanism does not work.
Serrano also said that other research has shown that mice and worms that eat less have slower metabolisms and live longer. But his study offers evidence that (46)
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