题目内容
7.Could smells affect your lifespan?Female fruit flies(果蝇) without the ability to smell food live longer than other fruit flies.The sense of smell may be connected to the cellular ageing (细胞老化) process in many other living things-even people.Such connection has recently been found in both worms and flies.For example,scientists found that removing fruit flies'ability to smell made them live nearly 20percent longer than flies with a sense of smell.They confirmed that food smells were the ones most likely to affect ageing,as nutrition(营养) and lifespan are known to be connected in many living things.To test the idea that food smells affect lifespan,they removed flies'ability to smell carbon dioxide,which is produced by some fly foods.They left the rest of the smelling system.
This action had no effect on male flies,but the females lived 30percent longer than normal.Removing the ability to smell CO2 may stop flies getting information about food availability.This could mean that food is not enough,causing processes that encourage flies to survive.Scientists found that the female flies stored extra fat and that both males and females immune(免疫) to CO2 were stronger against the stress than normal flies.It is suggested that females may simply be easily influenced by the smells of CO2.
Scientists point out that people don't know whether ageing and smell are connected in animals and humans.But they clearly experience physical changes after smelling food.
34.From the passage,we learn that what scientists found is toC.
A.show there is the best way to make lifespan longer
B.tell us we should remove our smell ability to live long
C.show the sense of smell can affect the cellular ageing process
D.explain fruit flies without ability to smell can live longer
35.Scientists do some researches to proveD.
A.the immune system of flies to CO2
B.the connections between nutrition and lifespan
C.the importance of food smells to our humans
D.the connections between food smells and lifespan
36.According to scientists'opinion,we can see thatB.
A.male flies in general can live longer than female ones
B.flies without ability to smell is encouraged to store extra energy
C.both male and female flies can live longer without the ability to smell
D.flies without ability to smell can also get information about food availability
37.Which of the following best describes the passage as a whole?B
A.CO2has few effects on female flies.
B.The sense of smell might have an effect on living things.
C.The sense of smell is necessary to humans'health.
D.Female fruit flies can always live longer than male flies.
分析 文章大意:主要介绍了气味是否会影响你的寿命?科学家通过在果蝇身上的实验,指出,人们不知道是否老化和嗅觉在动物和人类之间的连接.但他们清楚地体验了闻食物后的身体变化.
解答 34.答案:C.细节理解题.根据The sense of smell may be connected to the cellular ageing (细胞老化) process in many other living things-even people.可知,科学家发现嗅觉能影响细胞老化的过程.答案是C.
35.答案:D.细节理解题.根据Could smells affect your lifespan?可知,科学家做了许多研究去证明食物的气味和寿命之间的联系.答案是D.
36.答案:B.细节理解题.根据Scientists found that the female flies stored extra fat科学家发现雌性果蝇存储多余脂肪,可知答案是B.
37.答案:B.细节理解题.根据文章内容可知,对这篇文章描述最完整的是"嗅觉可以影响生物".答案是B.
点评 这类题型首先要理解文章大意,抓住重点语句,联系上下面,根据问题,选择合适答案.
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in Europe.The spring keeper was (15)B a job many years earlier by a young town
leader.His job was to take away the leaves from the pools in the mountain.He worked hard.
The village soon became an(16)A place for visitors.
Years passed.One evening the town leaders had a meeting.(17)B they reviewed(审核)
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For several weeks,(20)A changed.By early autumn,however,the tree leaves began
to fall and fell into the pools,(21)B the rushing flow of water.One afternoon someone(22)A that the spring water had turned yellow.A few days later,swans left,so did the tourists.Diseases reached deep into the village.
Quickly,the leaders held a special meeting.Realizing their(23)D,they asked the
old keeper of the spring to come back.And after a few weeks,the river of life began to clear up.Then,life(24)C to the village in the mountain.
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