A team of scientists says that playing sounds underwater can get fish to return to areas with severe

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A team of scientists says that playing sounds underwater can get fish to return to areas with severely damaged coral reefs(珊瑚礁）.
In an experiment, they found fish returned after hearing recordings of the sounds of a healthy ocean reef. The scientists placed underwater speakers in areas where coral had been dying in Australia’s northern Great Barrier Reef. They played the sounds over a period of about six weeks in 2017 and studied the results. The team reported that twice as many fish arrived in areas where the sounds of healthy coral were played.The sounds also led to a 50 percent increase in the number of species present in the area, the researchers found. Among the arriving fish were species that feed on all major food sources.
The researchers noted the importance of having many different kinds of fish return to the area. Different species of fish perform many activities that support the ocean environment and sea life. “Damaged reefs have a higher chance of recovery if they have healthy fish populations,” the scientists wrote in the report.
Steve Simpson is a professor at the University of Exeter who helped lead the research. He said in a statement that “healthy coral reefs are remarkably noisy places. ” They contain the sounds of many kinds of shrimp, fish and other sea creatures. Young fish listen for these sounds when they are looking for a place to settle, Simpson said.
He added that reefs “become ghostly quiet” when they suffer destruction that is usually related to human-caused pollution. Coral damage can cause unappealing smells and sounds that drive shrimp and fish away. But the experiment suggested that the use of underwater loudspeakers was an effective way to get young fish to come back.
Andy Radford, a professor at University of Bristol,said the underwater sounds are a promising way to fight coral reef damage at the local community level. But he noted that other threats need to be, reduced as well. These include climate change, pollution and overfishing.
8. What did the scientists find in the experiment?
A. Twice as many fish arrived in the healthy coral areas.
B. The sounds led to a 50 percent increase in the number of fish present in the area.
C. Playing the sounds of healthy coral reefs is effective to save dying coral.
D. Damaged reefs can recover completely if they have healthy fish populations.
9. According to Steve Simpson,what will drive fish away from damaged coral reefs?
A. Human-caused pollution.
B. The unattractive smells and sounds.
C. Climate change.
D. Overfishing.
10. What’s the main idea of the text?
A. Healthy fish help recover the damaged coral reefs by swimming.
B. People reduce environmental pollution to save dying coral.
C. Scientists find a new way to protect the ocean environment and sea life.
D. Researchers use underwater sounds to fight coral reef damage.
【答案】8. C    9. B    10. D
【解析】