Harvard researchers have created a tough，low­cost，

　　biodegradable(可生物降解的) material inspired by insects' hard outer shells.The material's inventors say it has a number of possible uses and someday could provide a more environmentally friendly alternative to plastic.The material(虾) shells and proteins produced from silkcades later，however，plastic's very durability(耐用性) is raising questions about how appropriate it is for one­time products such as plastic bagse will degrade for centuries.What is the point of making something that lasts 1，000 years?

　　Shrilk not only will degrade in a landfill，but its basic components are used as fertilizer(肥料) inventors said.Materials

　　from which it is made are plentiful in nature，found in everything ranging from shrimp shells，insect bodies to living plants.That makes shrilk low cost，and its mass production possible should it be used for products demanding a lot of material.

　　Work on shrilk is continuing in the lab.The inventors said the material becomes flexible when wet，so they're exploring ways to use it in wet environments.They're also developing simpler production processes，which could be used for non­medical products，like for computer cases and other products inside the home.They're even exploring combining it with other materials，like carbon fibers，to give it new properties.

　　1．Paragraph 1 of the passage is mainly about shrilk's ________．解析：主旨大意题。根据第一段中的最后一句“It is thin得知本段的主旨大意是关于shrilk的主要特点的。答案：C解析：主旨大意题。根据主题段第一段第二句中的“possible uses”和“alternative to plastic”得知本文的主旨大意是D项。答案：D

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