14.Could smells affect your lifespan?Female fruit flies(果蠅) without the ability to smell food live longer than other fruit flies.The sense of smell may be connected to the cellular ageing (細(xì)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 主要介紹了氣味是否會(huì)影響你的壽命,科學(xué)家通過(guò)在果蠅身上的實(shí)驗(yàn),指出,人們不知道是否老化和嗅覺(jué)在動(dòng)物和人類之間的連接.但他們清楚地體驗(yàn)了聞食物后的身體變化.
解答 21.C.細(xì)節(jié)理解題.根據(jù)The sense of smell may be connected to the cellular ageing (細(xì)胞老化) process in many other living things-even people.可知,科學(xué)家發(fā)現(xiàn)嗅覺(jué)能影響細(xì)胞老化的過(guò)程.答案是C.
22.D.細(xì)節(jié)理解題.根據(jù)Could smells affect your lifespan?可知,科學(xué)家做了許多研究去證明食物的氣味和壽命之間的聯(lián)系.答案是D.
23.B.細(xì)節(jié)理解題.根據(jù)Scientists found that the female flies stored extra fat科學(xué)家發(fā)現(xiàn)雌性果蠅存儲(chǔ)多余脂肪,可知答案是B.
24.B.細(xì)節(jié)理解題.根據(jù)文章內(nèi)容可知,對(duì)這篇文章描述最完整的是"嗅覺(jué)可以影響生物".答案是B.
點(diǎn)評(píng) 本文是科教類閱讀理解.做這類題材閱讀理解時(shí)要求考生對(duì)文章通讀一遍,做題時(shí)結(jié)合原文和題目有針對(duì)性的找出相關(guān)語(yǔ)句進(jìn)行仔細(xì)分析,結(jié)合選項(xiàng)選出正確答案.推理判斷題也是要在抓住關(guān)鍵句子的基礎(chǔ)上合理的分析才能得出正確答案,切忌胡亂猜測(cè),一定要做到有理有據(jù)