Plants can’t communicate by moving or making sounds, as most animals do. Instead, plants P

Plants can’t municate by moving or making sounds, as most animals do. Instead, plants Produce volatile pounds, chemicals that easily change from a liquid to a gas. A flower’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 plants. A tree under attack by Hungry insets, for instance, may give off volatile pounds 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（传感器）called an electronic nose. The “e-nose” can tell pounds that crop plants make When they’re attacked Scientists say the e-nose 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 than can house Thousands of plants.
The research team worked with an e-nose than recognizes volatile pounds. Inside the device, 13 sensors chemically react with volatile pounds Based on these interactions, the e-nose 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 crops. Then 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 e-nose, it turns out, could identify healthy cucumber, pepper and tomato plants based on The volatile pounds 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 fine-tuning, a device like the e-nose 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.
【小题1】We learn from the text that plants municate with each other by    .A．making some soundsB．waving their leavesC．producing some chemicalsD．sending out electronic signals【小题2】What did the scientists do to find out if the e-nose 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.【小题3】According to the writer, the most amazing thing about the e-nose is that it can    .A．pick out ripe fruitsB．spot the insects quicklyC．distinguish different damages to the leavesD．recognize unhealthy tomato leaves【小题4】We can infer from the last paragraph that the e-nose    .A．is unable to tell the smell of flowersB．is not yet used in greenhousesC．is designed by scientists at PurdueD．is helpful in killing harmful insectsＣ