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熄了灯，25.What is the highlight of Yuan's project for the competition?钦乃清越，乡A.Driving away illegal fishing boats.B.Improving the computer science.C.Developing water cannons.D.Saving manpower on boats.又渐26.What can we infer from paragraph 4?夜迢A.The process of the preparation went wellB.The water cannon system is a success.C.Nothing could be done without teamwork.D.Yuan has better academic achievements.27.Which of the following can best describe Yuan?B.Knowledgeable and sociable.但A.Responsible and brave.C.Enthusiastic and friendly.D.Ambitious and determined.cScientists have found a new way to break down a group of harmful chemicals that are very hard to get ridof.The discovery could help solve a dangerous and growing problemhow to clean up the pollution of“forever chemicals”.The group of chemicals known as PFAS()are pretty amazing.They're non-stick,waterproof,and grease-proof.They don't burn easily and they don't dissolve()in water.Businesses started puttingPFAS in all sorts of products,from non-stick pans to waterproof clothes,and from fire-fighting foam to rugsthat resist stains.Even things like food wrappers and floss for cleaning your teeth contain PFAS chemicals.But after a while,scientists realized that the same things that made the chemicals useful also caused a realproblem-PFAS doesn't break down in nature.It doesn't dissolve in water or burn.Not even bacteria canbreak PFAS down.That's why these chemicals are known as "forever chemicals".As a result,PFAS builds up in the environment.The chemicals are found in air,water,and dirt aroundthe world-and in animals and people.In the US,97%of humans have PFAS in their blood.Sadly,PFASchemicals are also toxic(有毒的)，and have been linked to many health problems.wNow scientists in the US have found a way to break down some PFAS chemicals.Their solution requiresboiling PFAS with two other very common chemicals.These chemicals can be found in just about any laboratory.Dr.Brittany Trang,one of the scientists involved,said she didn't even want to test the idea at first."Ithought it was too simple,”she said.“But the process worked..”Scientists are trying to figure out how to easily process large amounts of PFAS.It's important to note thatthe new method can only break down PFAS that have already been collected.Figuring out how to remove PFASchemicals from the environment and collect them remains a huge challenge.e好a,门28.What is the function of the first paragraph?gpnm年、dA.To make a conclusion.B.To put forward a new theory.C.To introduce a topic.D.To entertain the readers.29.Why is PFAS called“forever chemicals”?A.It is water-resistant.B.It's hard to break down.C.It is widely applied.D.It is non-sticky.30.What was Dr.Brittany Trang's attitude to the solution initially?A.Favorable.B.Objective.C.Indifferent.D.Questioning.高二英语第4页（共8页）