17．The loudest public food fight right now is about GMOs （轉(zhuǎn)基因生物），or genetically modified organisms．Scientists add genes to corn，soybeans，and other plants，usually to protect the crops from insects or herbicides．Proponents say that makes crops easier to grow and cheaper while opponents believe that GMOs have been linked to depression，allergies，infertility，and even cancer．Many consumers and food-safety inspectors worry that GMOs cause an unnatural threat to our health and the environment．
Although GMOs have been in our food supply for 20years，the controversy has moved to center stage．Recent documentaries and experts on The Doctor Oz Show have fanned the flames．About 75percent of consumers say they are concerned about the safety of genetically modified foods．Two states in the USA recently passed bills requiring labeling （標(biāo)記） of all foods made with GMOs； many other states are considering mandatory labeling．The European Union （EU） already requires labeling，and several countries，including France，have banned the planting of genetically modified crops．So are GMOs safe-or should you avoid them at all costs？Here，a look at the evidence．
Roughly 90% of the corn，canola，soybeans，and sugar beets grown in the United States have bits of DNA that originally came from a lab．Unless you've been eating only foods labeled 100percent organic-which must be GMO-free-you probably have GMOs in your system now．
In a big red-flag-raising study，F(xiàn)rench researchers reported last year that rats developed huge tumors （瘤） after living on genetically modified corn for two years．"Genetic engineering can have unintended consequences，"says Bill Freese，science policy analyst for the Center for Food Safety．Artificial genes force plants to produce unnatural proteins （蛋白質(zhì)），he says，and no one knows how those may affect human health．
But scientists immediately criticized the French study．For one thing，the types of rats used in the study were highly prone （傾向于） to cancer，so it was predictable that some would develop tumors after eating GMOs，notes Nina Fedoroff，a professor of biology and life sciences at Penn State University．She adds，"We've eaten these foods for 20years and aren't walking around with giant tumors．"
Hundreds of other studies have found no trouble with GMOs，says Ruth MacDonald，professor at Iowa State University．After looking at more than 130research projects，the EU concluded that there's nothing especially risky about them．
In September，the editors of Scientific American denounced the efforts to label GMO foods，stating that there's no proof that GMOs can endanger people's health．Adding genes to crops isn't any more dangerous than traditional breeding （繁殖），which farmers have done for thousands of years，the American Association for the Advancement of Science declared in 2012．Old methods of modifying crops mixed tens of thousands of genes with unpredictable results．The fact that scientists can now insert single genes into corn or soybeans shouldn't raise any new alarms，says Fedoroff．
There doesn't appear to be a scientific reason to ban GMO foods from your cupboard to protect your health．But it is healthy to limit your intake of the processed foods that often contain them．And don't assume that GMO-free packaged good is necessarily healthy．Organic cookies can still contain too much sugar or salt．
63．Which of the following have made the argument about GMOs fiercer？B
A．Some consumers and inspectors．
B．Some documentaries and experts．
C．Some newspapers and magazines．
D．Some scientists and administrators．
64．We can infer from the passage thatC．
A．some countries like France have suffered severely from GMOs
B．most crops grown in the United States are genetically modified
C．EU consumers can buy GMOS or GMO-free foods as they like
D．GMO-free foods can hardly be found in American markets now
65．The underlined word"denounced"in Paragraph 7means"A"．
A．condemned
B．confirmed
C．a(chǎn)dvocated
D．a(chǎn)ssessed
66．The author writes the passage for the purpose ofC．
A．a(chǎn)ppealing to people to reject GMO foods
B．proving GMO goods harmless for humans
C．sharing with people opinions about GMOs
D．throwing doubt on the results of researches．
分析 本文屬于說明文閱讀，作者通過這篇文章向我們介紹了人們對于轉(zhuǎn)基因生物的觀點(diǎn)，一些支持者認(rèn)為該技術(shù)可以使農(nóng)作物更容易生長、而且會使作物更便宜，而反對者則認(rèn)為轉(zhuǎn)基因生物帶來了一些負(fù)面效應(yīng)，且我們不知道轉(zhuǎn)基因生物對我們是否健康．
解答 63．B 考查細(xì)節(jié)理解．根據(jù)第二段第二句"Recent documentaries and experts on The Dr．Oz Show have fanned the flames．"可知一些專家以及紀(jì)錄片對轉(zhuǎn)基因生物的爭論很激烈，故選B．
64．C 考查推理判斷．根據(jù)第六段After looking at more than 130research projects，the EU concluded that there's nothing especially risky about them．可知?dú)W盟認(rèn)為這些轉(zhuǎn)基因生物的食品沒有什么特別的風(fēng)險．故選C．
65．A 考查詞義猜測．第二段中提到美國有些州要求必須有標(biāo)簽標(biāo)明是否是轉(zhuǎn)基因食物，而第七段In September，the editors of Scientific American denounced the efforts to label GMO foods，stating that there's no proof that GMOs can endanger people's health．講述了編輯們聲明沒有證據(jù)表明轉(zhuǎn)基因食物能危害人體健康，由此可推知編輯們是譴責(zé)那些要求貼標(biāo)簽的行為．故選A．
66．C 考查寫作意圖．本文主要介紹了人們對轉(zhuǎn)基因生物的觀點(diǎn)，支持者認(rèn)為該技術(shù)可以使農(nóng)作物更容易生長、更便宜，而反對者則認(rèn)為轉(zhuǎn)基因生物帶來了一些負(fù)面效應(yīng)．由此可知作者寫作本文的目的是讓人們了解一些對轉(zhuǎn)基因生物的觀點(diǎn)，故選C．
點(diǎn)評 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．在做推理判斷題時不要以個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．
