3、Since the gene, called DAF-16 in worms, was found in
many animals and in humans, the finding could open up new ways to affect aging,
immunity(免疫)and resistance in humans, the scientists
said.
“We wanted to find out how
normal aging is being governed by genes and what effect these genes have on
other traits, such as immunity,” said Robin May of the
University of Birmingham, who led the study.
Populations across the world are
aging at a surprising pace, bringing potentially big challenges for health and
social care systems.A
study by Danish scientists last year found that half of babies born in the rich
world today will live to celebrate their 100th birthdays.Scientists are eager to find out how people age to try to develop
drugs to help them stay healthier as their lives extend.
“What we have found is that
things like resistance and aging tend to go hand in hand,” May said in an interview.
May’s team compared longevity, stress resistance and
immunity in four related species of worm.They also
looked for differences in the activity of DAF-16 in each of the four species,
and found that they were all quite distinct.
May said DAF-16 was active in most
cells in the body and was very similar to a group of human genes called FOXO
genes, which scientists believe play a role in the aging process.
“The fact that subtle(微妙的)differences in DAF-16 between species seem to have such an impact on
aging and health is very interesting and may explain how differences in
lifespan and related traits have arisen during evolution,” May said.
1.In which section may the text appear in a newspaper?
A.Education.
B.Science.
C.Entertainment.
D.Culture.
2.According to May,_________,.
A.resistance has a lot
to do with aging
B.FOXO genes can be
found in worms
C.genes play the same
role in different species
D.new drugs will change
the genes in older people
3.What can we know from the third paragraph?
A.New ways have been
found to affect aging.
B.Babies in the rich world
will all live longer.
C.Present social care
systems are poorly managed.
D.Aging populations are
causing more challenges.
4.From the text we know that DAF-16 .
A.is a gene that is only
found in worms
B.can make people live
longer
C.has an effect on aging
and immunity
D.has been quite
familiar to scientists
5.What can be the best title of the passage?
A.Scientists Find Gene
Linked to Aging
B.Population Aging
Faster than Expected
C.How to Make People
Live Longer
D.Gene Determines How
Long We Live