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C.It makes people know more about themselves.D.It is often limited by the level of the techniques.30.Who can benefit from expressive arts therapy a lot?A.The person who is expert in art.B.The person who is short of creativity.C.The person experiencing physical diseases.D.The person suffering from mental health problems.31.What can be inferred about types of expressive arts therapy?A.They are various.B.They are difficult to use.C.They can't be combined.D.They can improve people's imagination.DRobotic fish might help solve an ecological problem by scaring an invasive()fish species so seriouslythat it is put off reproducing.Eastem mosquitofish were introduced in many parts of the world to eat mosquito larvae and keep the disease-spreading insects under control.But they have had a negative and unintended influence on local animals:theychew the tails of native freshwater fish and tadpoles,leaving them to die.Reducing numbers of eastern mosquitofish without harming other wildlife is a difficult prospect,but GiovanniPolverino at the University of Western Australia and his colleagues have come up with a potential solution.Theydesigned a robotic version of the largemouth bass,which naturally feeds on mosquitofish.The robot fish looks likethe real predator and even simulates()its swimming behavior.It is controlled from underneath an aquarium(水族馆)via magnets.Polverino's team ran experiments in aquariums with six wild-caught eastern mosquitofish and six wild-caughttadpoles.When an overhead camera saw a mosquitofish move to attack the tadpoles,the robot fish simulated itsown attack on the mosquitofish.The researchers say that after these robot attacks,the eastern mosquitofishexhibited weight loss,changes in body shape and a reduction in fertility,which they believe would lead to reducednumbers.Male fish began to develop thinner and more streamlined bodies with stronger tail muscles to escapepredators,while females produced lighter eggs.These effects lasted several weeks even without succeeding attacks."This global pest is a serious threat to many aquatic animals,"said Polverino."Instead of killing them one byone,we're presenting an approach that can inform better strategies to control this global pest.We made their worstnightmare become real."The team admits that the robot fish cannot yet operate in the wild,but says it presents a promising startingpoint for future research.32.How do robotic fish reduce eastern mosquitofish's population?A.By killing them.B.By damaging their home.C.By frightening them.D.By introducing their enemy.33.What can we know about easter mosquitofish?A.It changes local ecological environment.B.It influences native freshwater fish's number.C.It was brought in to control disease-spreading wildlife.D.Its swimming behavior was simulated to scare insects.34.What does the underined word"fertility"in Paragraph 4 mean?A.The ability to reproduce.(5-5)
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