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listening out for animal calls is much easier than digging about in the undergrowth lookingexpert pair of ears.In a paper published on October 17th in Nature Communications, a group ofresearchers led by Jorg Muiller, an ecologist at the University of Wirzburg, describe abetter way: have a computer do the job.Smartphone apps already exist that will identifybirds, bats or mammals simply by listening to the sounds they make. Their idea was toapply the principle to conservation work.The researchers took recordings from across 43 sites in the Ecuadorean rainforest.Sound recordings were taken four times every hour, over two weeks. The various callswere identified manually by an expert, and then used to construct a list of the speciespresent. As expected, the longer the land had been free from agricultural activity, thegreater the biodiversity it hosted.Then it was the computer's turn. The researchers fed their recordings toartificial-intelligence models that had been trained, using sound samples from elsewhere inEcuador, to identify 75 bird species from their calls. “We found that the AI tools couldidentify the sounds as well as the experts," says Dr Muiller.Of course, not everything in a rainforest makes a noise. Dr Miiller and his colleaguesused light-traps to capture night-flying insects, and DNA analysis to identify them.Reassuringly, they found that the diversity of noisy animals was a reliable proxy (指标）forthe diversity of the quieter ones, too.The results may have relevance outside ecology departments, too. Under pressurefrom their customers, firms such as L'Oreal, a make-up company, and Shell, an oil firm,have been spending money on forest restoration projects around the world. Dr Mullerhopes that an automated approach to checking on the results could help monitor suchefforts, and give a standardized way to measure whether they are working as well as theirsponsors say.32.Which of the following best describes Dr Muller's method of bio-acoustic analysis?A.Costly.B. Impractical.C.High-tech. D.Labor-consuming33.What can we learn from the research of Dr Miller?A.The species in the rainforests have increasedB.Agricultural activity negatively influenced therichness in species.C. There are more reliable sound recordings in Ecuadorean rainforestD.Trained AI models can identify as many kinds of sounds as experts.34.Why did Dr Miller and his colleagues do the survey in Paragraph 5?A. To figure out the species of quieter animals.B. To confirm the biodiversity of the quieter animals.C. To emphasize the biodiversity of the noisy animals.D.To compare the noisy animals and the quieter ones.35. What's the main idea of the last paragraph?A. The investment in bio-acoustic analysis.B. The importance of forest restoration projects.C