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2英语答案 趣对答案)
waste,said EMPA's Gustav Nystrom,the inventor.He told TIMEMagazine they wanted to improve the efficiency of the battery in the futureand get it working for longer.Each year TIME Magazine lists a selection of best inventions that"change how we live",based on their originality,creativity,efficiency,impact and other criteria.28.What did the researchers aim to do by developing a paper battery?A.Create more environmentally friendly materials.B.Win the best experimental invention of this year.C.Reduce the impact of electronics on the environment.D.Make the development of electronic devices grow faster.29.How did the researchers increase the performance of the battery?A.By rewetting the paper.B.By dropping more ink.C.By shortening its working hours.D.By adding another paper battery.30.What aspect of the battery do the researchers plan to promote accordingto Gustav Nystrom?A.Its creativity.B.Its packaging.C.Its technology.D.Its efficiency.31.What is the text mainly about?A.Scientists invent a paper battery-just add water.B.Paper battery is named among world's best inventions.C.TIME Magazine lists a selection of inventions each year.D.A new role for paper may help reduce the electronic waste.DA college professor at my university years ago shocked his class with afrog.He showed off a wood frog that was still alive but frozen solid.Thensuddenly,he threw it against a wall and it broke into pieces.Everyone tooka quick deep breath.Moments later,he explained that he hadn't actuallythrown the frog.For dramatic effect he had switched the frog for a largepiece of ice.But the goal was to illustrate a point:That a wood frog does in英语试题第7页（共14页）
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