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大学生英语四级考试阅读模拟训练及答案大学生英语四级考试阅读模拟训练及答案 A sunfloweris asunflower.A mobile phone isa mobile phone.But canyou47the twoto dosomething foryour local48 It maywell bepossible.When youhave finishedwith yourmobilephoneyou willbe ableto49it inthe gardenor aplant potand waitfor itto flower. 50,a biodegradable生物可降解的mobilephonewas introducedby scientists.It ishoped thatthe new type ofphone willencourage51to recycle. Scientists havee upwith anew materialover thelast fiveyears.It lookslike anyother52and canbe hardor soft.and ableto changeshape.Overtime itcan alsobreak downinto thesoil withoutgiving outany toxic
53.British researchersused thenew materialto developa phonecover thatcontains asunflower seed.When thisnewtypeof coverturns intowaste,it54nitrates硝酸盐.These feedthe seedand helpthe flowergrow. Engineers havedesigned asmall55window tohold theseed.They havemade sureit onlygrows whent...。