题目内容
14.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 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 intact.
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 CO2were 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.
21.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
22.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
23.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
24.Which of the following best describes the passage as a whole?B
A.CO2 has 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 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 21.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.
22.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.
23.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.
24.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 本文是科教类阅读理解.做这类题材阅读理解时要求考生对文章通读一遍,做题时结合原文和题目有针对性的找出相关语句进行仔细分析,结合选项选出正确答案.推理判断题也是要在抓住关键句子的基础上合理的分析才能得出正确答案,切忌胡乱猜测,一定要做到有理有据
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