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Both humans and animals possess the ability to cry out for help when endangered or threatened. Plants, as it turns out, can too.
“We found that plants usually emit(发出)sounds when they are under stress and that each plant and each type of stress is associated with a specific identifiable sound," researchers from Tel Aviv University in lsrael wrote in their findings published in the scientific journal Cell “While undetectable to the human ear, the sounds emitted by plants can probably be heard by various animals such as bats, mice, and insects.
Stressors like dehydration(脱水) and damage to leaves gave rise to the plants high-pitched(尖声的) cries, which ranged from 20 to 250 kHz. The bigger the danger, the more frequent a plant's signals."Unstressed plants emitted less than one sound per hour, on average, researcher Lilach Hadany said,“while the stressed plants-both dehydrated and injured-emitted dozens of sounds every hour.”
To catch these sounds, Hadany's team surrounded tomato and tobacco plants with super-sensitive microphones. They then fed the data into an artificial intelligence program that could tell the difference between the species of plant and the types of sounds produced.“Our findings suggest that the world around us is full of plant sounds, and that these sounds contain information, Hadany wrote. She added that to translate that information, we just need the “right tools-such as sensors that tell growers when plants need watering.Doing so, researchers noted, may allow farmers to judge exactly when and where to water crops-Saving water, increasing harvests, and lowering stress for both plant and humankind.
1.What did researchers from Tel Aviv University in lsrael find?
A.Creatures tend to cry out for help when in danger.
B.Plants can give off sounds when they are stressed.
C.Plant sounds can be heard by both animals and humans.
D.Plants make the same sound whatever type of stress they have.
2.What does the author want to show in paragraph 3?
A.The influence of stress on plants.
B.The urgency of relieving stress of plants.
C.The possibility of plants emitting sounds.
D.The importance of conducting the arch.
3.Why was an artificial intelligence program used in the research?
A.To help get rid of plant stress.
B.To identify the types of stress.
C.To collect sounds emitted by plants.
D.To analyze the collected sounds of plants.
4.What can we learn from Hadany's words in the last paragraph?
A.The research is of practical value.
B.It's difficult to understand plant sounds.
C.Further research is needed in the future.
D.It's as easy as pie for farmers to grow crops.

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