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Plants can?t communicate by moving or making sounds, as most animals do. Instead, plants produce volatile compounds，chemicals that easily change from a liquid to a gas. A flower? s sweet smell, for example, comes from volatile compounds that the plant produces to attract insects such as bugs and bees.
Plants can also detect volatile compounds produced by other plants.A tree under attack by hungry insects, for instance, may give off volatile compounds that let other trees know about the attack. In response, the other trees may send off chemicals to keep the bugs away — or even chemicals that attract the bugs? natural enemies.
Now scientists have created a quick way to understand what plants are saying: a chemical sensor(傳感器) called an electronic nose. The “enose” can tell compounds that crop plants make when they?re attacked.Scientists say the enose could help quickly detect whether plants are being eaten by insects. But today the only way to detect such insects is to visually inspect individual plants. This is a challenging task for managers of greenhouses ，enclosed gardens
?
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that can house thousands of plants.
The research team worked with an enose that recognizes volatile compounds. Inside the device, 13 sensors chemically react with volatile compounds. Based on these interactions, the enose gives off electronic signals that the scientists analyze using computer software.
To test the nose, the team presented it with healthy leaves from cucumber, pepper and tomato plants, all common greenhouse crops. Then the scientists collected samples of air around damaged leaves from each type of crop. These 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 compounds they produce. It could also identify tomato leaves that had been damaged. But 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 finetuning，a device like the enose could one day be used in greenhouses to quickly spot harmful bugs, the researchers say. A 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, Ind. who studies smells of flowers and plants. Hopefully, scientists believe, the device could bring large benefits to greenhouse managers in the near future.
[語篇解讀] 植物會(huì)說話嗎?植物如何“交流”?本文中的科學(xué)家們正在嘗試用enose來測(cè)試植物受到傷害時(shí)的反應(yīng)。
1.We learn from the text that plants communicate with each other by________.
A. making some sounds B. waving their leaves
C. producing some chemicals D. sending out electronic signals
[解析] 事實(shí)細(xì)節(jié)題。從文章第一段中的“Instead，plants produce volatile compounds，chemicals that...”可知，植物通過它本身所產(chǎn)生的一種化學(xué)物質(zhì)來進(jìn)行交流，所以答案選C。
[答案] C
2.What did the scientists do to find out if the enose worked?
A. They presented it with all common crops. B. They fixed 13 sensors inside the device.
C. They collected different damaged leaves. D. They made tests on damaged and healthy leaves.
[解析] 邏輯推理題。從文章第五段可知，為了證實(shí)enose的效果，科學(xué)家用受到傷害的葉子與健康的葉子來測(cè)試。所以選D。
[答案] 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
[解析] 事實(shí)細(xì)節(jié)題。從倒數(shù)第二段中的“But even more impressive，the device could tell which type of damage...”可知，最令人驚奇的是enose能夠分辨葉子受到的不同的“傷害”。
[答案] C
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
[解析] 邏輯推理題。從文章最后一段中的“could one day be used in greenhouses to...”推斷可知，enose還沒有運(yùn)用到greenhouses中，由此推斷B是答案。
[答案]B
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