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______ in a stadium. A. put away B. put up C. put out D. put off 10. The children went home from the grammar school, their lessons________for the day. A. finishing B. finished C. had finished D. were finished 能力提升 閱讀理解 Harvard researchers have created a tough, low173。 Period One Warm173。up amp。cost, biodegradable(可生物降解的 ) material inspired by insects’ hard outer material’s inventors say it has a number of possible uses and someday could provide a more environmentally friendly alternative to material, made from shrimp(蝦 ) shells and proteins produced from silk, is called “shrilk” . It is thin, clear, flexible and strong. A major benefit of the material is its ’s toughness and flexibility represented a revolution in materials science during the 1950s and ’ later , however, plastic’s very durabil ity(耐用性 ) is raising questions about how appropriate it is for one173。lived consumer goods, used in the home for a few years and then cast into a landfill where they will degrade for is the point of making something that lasts 1,000 years? Shrilk not only will degrade in a landfill, but its basic ponents are used as fertilizer(肥料 ), and so will enrich the soil. Shrilk has great potential, the inventors from which it is made are plentiful in nature, found in everything ranging from shrimp shells, in