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A new study shows that plants are creating frequencies in response to their surroundings, or in other words, they are reacting. These “reactions” in plants, which we could see as analogical to human senses, are actually nothing new. We have learned over the past few years that plants are capable of seeing, hearing, and smelling. And with this newest finding we are just one sense away from completing the five human senses in some plants. For the first time, plants have been recorded making airborne sounds when stressed, which researchers say could open up a new field of precision agriculture where farmers listen for water starved crops. The researchers found that tomato and tobacco plants made sounds at frequencies humans cannot hear when facing situations such as lack of water or when being cut. On average, drought-stressed tomato plants made 35 sounds per hour, while tobacco plants made 11 and unstressed plants produced fewer than one sound per hour. The researchers trained a machine-learning model to tell difference between the plant’s sounds and the wind, rain, and other surrounding noises of the greenhouse, in order to correctly identify the source of stress. Results showed that drought-stressed plants make significantly more sounds than control plants. Humans cannot hear the whole range of frequencies around us. If we could, we would likely become absent-minded and anxious by always hearing the frequencies around us including radio frequencies from cell towers near us or even cooking a frozen meal in the microwave. Thankfully, the range of human hearing is typically considered to be only 20 Hz to 20,000 Hz. That is why humans are not sensitive to the sounds that plants are making.
What is the newest finding about plants?
A
B
C
D
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答案：
解析：
：根据文章中的描述，最新的研究发现植物在面临压力时会发出声音，这些声音是人类无法听到的频率。因此，正确答案是D，即植物会说话。
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