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are what we all need to survive.Please help us and help yourselves.Keep the Endangered SpeciesAct unbroken.八必o0x”B.Human's huntingC.A shortage of food.D.Attacks from other species5.What can we infer about the Endangered Species Act passed in 1973?A.It was ignored by the public.B.It was declared too late..It was unfair.不D.It was effective.有mhat does the st paragh intend to sny?A.The government is short-sighted.B.Ecological development is unbroken.C.Economy is worsening gradually.D.The Act needs to be revised again.What is the doing in theA.Making comments on a law.B.Asking for help.C.Delivering a speech.D.Providing a proposal.CThe world's most famous violins were hand-crafted by Antonio Stradivari,an Italian luthierwho made some 1,200 violins and sold them only to the very rich.But even for those who dreamof owning a violin of their own,the violin is too expensive.Now young musicians who want topossess a violin may be able to purchase an affordable 3D-printed version.Designed as an award-winning web-based music education program for young violinists,theAVIVA Young Artists Program,the project has three goals.AVIVA Director Dr.Mary-ElizabethBrown told EurekA/er."Our goals were.to explore the new sound world created by using newmaterials and the new technology used in other fields and to make music education sustainable andaccessible through the printing of more durable instruments."According to Interesting Engineering,the violin was built in two pieces using 3D printing.Insimple terms,3D printing is a manufacturing process in which a physical object is created from adigital design by combining together thin layers of material that are printed by the machine.Theneck and fingerboard of the violin are printed in smooth plastic to provide a comfortable grip (for the musicians,while the violin's body is made up of a plastic polymer substance and engineeredto generate a resonant(共鸣的)tone.Once it's all put together,the instrument is said to produce a sound that's darker and mellowerthan that of a traditionally-built violin.As an added bonus,the AvIVA violin is also less fragile thanits traditional wooden cousins.Although"budget"violins for children do already exist,reasonable-quality models are typicallystill quite pricey.By contrast,AVIVA's 3D-printed violin will reportedly be priced in a much lowerrange and will include printing costs,with an additional charge to get the violin fully assembled.The second part of the creation process involves purchasing and installing third-party non-3Dprinted parts such as strings,a chin rest,a tailpiece,and tuning pegs.Brown suggested that buyingsuch components wholesale makes more sense than printing them all out for each build as it allowsfor a higher level of customization for each student.扫描全能王创建