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【正文】 ly change from a liquid to a flower39。s sweet smell， for example， es from volatile pounds that the plant produces to attract insects such as bugs and bees. ? Plants can also detect volatile pounds produced by other tree under attack by hungry insects， for instance， may give off volatile pounds that let other trees know about the response， the other trees may send off chemicals to keep the bugs away—or even chemicals that attract the bugs39。 natural enemies. ? Now scientists have created a quick way to understand what plants are saying： a chemical sensor(傳感器 ) called an electronic “ enose” can tell pounds that crop plants make when they39。re say the enose could help quickly detect whether plants are being eaten by today the only way to detect such insects is to visually inspect individual is a challenging task for managers of greenhouses， enclosed gardens that can house thousands of plants. ? The reasearch team worked with an enose that recognizes volatile the device,13 sensors chemically react with volatile on these interactions，the enose gives off electronic signals that the scientists analyze using puter software. ? To test the nose， the team presented it with healthy leaves from cucumber，pepper and tomato plants， all mon greenhouse the scientists collected samples of air around damaged leaves from each type of plants had been damaged by insects， or by scientists who made holes in the leaves with a hole punch(打孔器 )． ? The enose， it turns out， could identify healthy cucumber， pepper and tomato plants based on the volatile pounds they could also identify tomato leaves that had been even more impressive， the device could tell which type of damage—by insects or with a hole punch—had been done to the tomato leaves. ? With some fiuning， a device like the enose could one day be used in greenhouses to quickly spot harmful bugs， the researchers device like this could also be used to identify fruits that are perfectly ripe and ready to pick and eat， says Natalia Dudareva， a biochemist at Purdue University in West Lafayette， studies smells of flowers and ， scientists believe， the device could bring large benefits to greenhouse managers in the near future. ? 1． We learn from the text that plants municate with each other by ________. ? A． making some sounds ? B． waving their leaves ? C． producing some chemicals ? D． sending out electronic signals ? 答案與解析： C 細(xì)節(jié)理解題。根據(jù)第一段第二句話中 plants produce volatile pounds...可知植物傳遞信息的方式是產(chǎn)生易揮發(fā)的化合物，故選 C。 ? 2． What did the scientists do to find out if the enose worked? ? A． They presented it with all mon crops. ? B． They fixed 13 sensors inside the device. ? C． They collected different damaged leaves. ? D． They made tests on damaged and healthy leaves. ? 答案與解析： D 細(xì)節(jié)理解題。根據(jù)第五段可知科學(xué)家對(duì)健康的和受損的葉子分別進(jìn)行實(shí)驗(yàn)來驗(yàn)證電子鼻的作用，故選 D。 ? 3． According to the writer， the most amazing thing about the enose is that it can ________. ? A． pick out ripe fruits ? B． spot the insects quickly ? C． distinguish different damages to the leaves ? D． recognize unhealthy tomato leaves ? 答案與解析： C 細(xì)節(jié)理解題。根據(jù)第六段最后一句中的 But even more impressive， the device could tell which type of damage...可知電子鼻最令人驚異的是能區(qū)分受損的類別，故選 D。 ? 4． We can infer from the last paragraph that the enose ________. ? A． is unable to tell the smell of flowers ? B． is not yet used in greenhouses ? C． is designed by scientists at Purdue ? D． is helpful in killing harmful insects ? 答案與解析： B 推理判斷題。根據(jù)最后一段所用的虛擬語氣的謂語形式 (使用could)可知選 B。