15.Spring is here,the colourful flowers are seen everywhere but it is pity that many of us are not able to smell them while enjoying the colourful flowers?
Growing levels of air pollution from the factories and cars have reduced flower fragrances(芳香) by up to 90percent in the US,compared with pre-industrial levels 100years ago.
But if the trend is simply unpleasant for human noses,it may be life-dangerous for bees and butterflies.
Many insects find flowers by following the scent produced by those flowers.
The increasing pollution makes it difficult for them to find the flowers and feed on their nectar(花蜜).
Scientists have already found that flowers produce scent molecules(氣味分子) that mix with polluted things,which breaks down the plants'sweet smell.
With more pollution in the air,the scent molecules don't remain powerful as long and travel shorter distances on the wind.In the mid-19th century,when pollution levels were first recorded,scent molecules would have been able to travel some 1,000to 1,200meters.Today,in the polluted air of large cities,scents may only make it some 200to 300meters.
Also,pollution from polluted air may fool the bee's"nose",making their search for flowers all the more difficult.
In a paper published recently in Scientific Reports,scientists said that the nitric oxide(NO) and nitrogen dioxide (NO2)in polluted air could change many chemicals that work together to give a flower its special smell.
This,researchers said,"could prevent honeybees from reaching their flowers and prevent the pollination(授粉) of some of the world's food crops."Or,this could put in danger agricultural harvests worldwide.
But the bees seem to have learned to get used to the changing world."In nature honeybees use their special eyes and flower smell to find out where a flower is for the first time,"the researchers said.
57.According to the article,researchers have recently found thatB.
A.reduced flower fragrances have resulted in the dying out of many bees and butterflies
B.reduced flower fragrances are connected to growing levels of air pollution
C.polluted things in the air prevent flowers from producing scent molecules
D.flowers today can't produce enough nectar because of air pollution
58.What do the underlined words"the trend"in Paragraph 3refer to (指的是)?B
A.Increasing air pollution
B.Reduce flower fragrances.
C.Human beings'worse sense of smell
D.A growing number of power plants and cars
59.The scent molecules a plant produces are mainly toC.
A.help flowers to produce nectar
B.prevent insects from eating the plant
C.draw attention from bees and butterflies
D.clear up polluted things in the air
60.We can infer(推斷) from the article thatB.
A.future food crops won't depend on bees to complete their pollination
B.some bees have successfully get over the challenge of reduced flowers fragrance
C.bees have great advantages in their senses compared to humans.
D.world food crop production is likely to fall greatly in the near future.
分析 文章大意:主要描述了隨著工業(yè)的發(fā)展,污染相當(dāng)嚴(yán)重,使靠氣味尋找花采蜜的蜜蜂很困難找到花,但一份研究表明,蜜蜂似乎已經(jīng)適應(yīng)了這個變化,同樣找到花采蜜.
解答 57題答案:B 考查細(xì)節(jié)理解題,根據(jù)文中的第一段Spring is here,the colourful flowers are seen everywhere but it is pity that many of us are not able to smell them while enjoying the colourful flowers?可知日益嚴(yán)重的污染使我們聞不到花香,故答案是B.
58題答案:B 考查詞匯題,根據(jù)文中的第二段Growing levels of air pollution from the factories and cars have reduced flower fragrances by up to 90percent in the US,compared with pre-industrial levels 100years ago.從100年前的工業(yè)水平來看,工廠和汽車的空氣污染水平在美國已經(jīng)減少了多達百分之90的花香.可知后面說這種趨勢指的是花香的減少,故答案是B.
59題答案:C 考查細(xì)節(jié)理解題,根據(jù)文中的倒數(shù)第二段This,researchers said,"could prevent honeybees from reaching their flowers and prevent the pollination of some of the world's food crops."Or,this could put in danger agricultural harvests worldwide.可知 花的氣味是吸引蜜蜂和蝴蝶授粉,故答案是C.
60題答案:B 考查細(xì)節(jié)理解題,根據(jù)文中的最后一段But the bees seem to have learned to get used to the changing world."In nature honeybees use their special eyes and flower smell to find out where a flower is for the first time,"the researchers said.可知但蜜蜂似乎已經(jīng)學(xué)會了適應(yīng)變化的世界,"在自然界中,蜜蜂第一次用它們特殊的眼睛和花的氣味來發(fā)現(xiàn)花,故答案是B.
點評 本文是一篇日常生活類閱讀,題目涉及多道細(xì)節(jié)理解題,做題時結(jié)合原文和題目有針對 性找出相關(guān)語句進行仔細(xì)分析,結(jié)合選項選出正確答案.推理判斷也是要在抓住關(guān)鍵句子的基礎(chǔ)上合理的分析才能得出正確的答案.