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32.How did the researchers deal with the waste cooking oil?A.They broke it down.B.They threw it away directly.C.They recycled it to produce new cooking oil.D.They made plastic ink for 3D printers from it.33.What inspired Simpson's idea?A.An accidental discovery.B.Previous studies.C.A visit to a campus.D.The challenge from McDonalds.34.What is the feature of the new printing material?A.They dry more quickly.B.They are lower in cost.