分析 本文是說(shuō)明文.文章介紹了仿生學(xué)應(yīng)用的三個(gè)例子.
解答 32.C.細(xì)節(jié)理解題.根據(jù)第二段中的UBderthe microscope,he discovered that these seeds had hooks on them,so they could easily stick to qothi^or hair.He copied this idea and invented Velcro?可知,George de Mestra在研宄了一些植物的種子后獲取靈感,發(fā)明了魔術(shù)貼,故選C.
33.A.推理判斷題.根據(jù)第三段中的TheSpeedo Fastskin% a controversial swimsuit,was seen at the Beijing Olympics and worn by 28 of the 33 gold medal winners.The technology is based on the rough patterns on a shark's skin,which allows the shark to swim faster 可知,璧魚皮的紋理使鯊魚游得更快.由此可推測(cè),運(yùn)動(dòng)員穿著 模擬了該紋理的泳衣也應(yīng)該能游得更快,33名 游泳冠軍有28名穿著該泳衣也能說(shuō)明這一點(diǎn),故選A.
34.D.細(xì)節(jié)理解題.根據(jù)倒數(shù)第二段中的 Scientists studied how eagles see things clearly.They discovered that a substance called yellow oil in their eyes does the trick 可知,鷹眼睛里一 種叫黃油的物質(zhì)讓它們有敏銳的視力,故選D.
35.B.標(biāo)題歸納題.文章介紹了仿生學(xué)應(yīng)用的三 個(gè)例子,通過(guò)這幾個(gè)例子我們可以看出,仿生學(xué)的應(yīng)用就像魔法一樣,能解決我們碰到的問(wèn)題 或啟發(fā)人們?cè)O(shè)計(jì)出滿足某種需求的產(chǎn)品.故選B.
點(diǎn)評(píng) 考查學(xué)生的細(xì)節(jié)理解和推理判斷能力.做細(xì)節(jié)理解題時(shí)一定要找到文章中的原句,和題干進(jìn)行比較,再做出正確選擇.在做推理判斷題時(shí)不要以個(gè)人的主觀想象代替文章的事實(shí),要根據(jù)文章事實(shí)進(jìn)行合乎邏輯的推理判斷.
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B vitamins(維生素)may offer some protection against the effect of air pollution,a new study suggests.
The scientists say the effect is real but stress the limitations of their work.Follow-up studies are urgently needed, they say,in heavily polluted cities like Mexico.
According to the World Health Organization (WHO),over 90% of the world's population live in heavily-polluted areas.The one of the pollutants that is considered the most dangerous is very fine particulate matter, referred to as PM2.5.At around 1/30 the width of a human hair,PM2.5 can go deep into the human lung and contribute to lung and heart health problems in the young and old.
Scientists have long suspected that PM2.5 causes what are termed epigenetic(表觀遺傳)changes in our cells that can damage our health.Now in this new human trial,an international team of scientists wanted to see if exposure to concentrations of PM2.5 could be mitigated by daily B vitamins.
Ten volunteers were tested initially exposed to clean air and their basic responses were measured.The same volunteers were later tested with large doses(劑量)of B vitamins while exposed to air containing high levels of PM2.5.The researchers found that a four-week B vitamin intake limited the PM2.5 effect by between 28-76% at ten gene locations.They found a similar reduction in effect on the mitochondrial DNA,the parts of cells that produce energy.
However,the researchers caution that their study,while observing a real effect,has limitations.As well as the small number of participants,there was little information on the size of the B vitamin dose that caused the response.
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