B.it can be found in living things
C.its mass production has been realized
D.its raw materials are abundant in nature
69. What are the inventors doing in the lab?
A.Replacing carbon fibers with shrilk.
B.Testing shrilk's use in wet conditions.
C.Making shrilk out of used household goods.
D.Improving shrilk’s flexibility for medical purposes.
70. Which of the following can be the best title for the passage?
A.Recent Progress in Environmental Protection
B.Benefits of Insects in Scientific Research
C.The Harm of Onetime Products
D.A Possible Alternative to Plastic
【要点综述】本文是一篇科普说明文。介绍了科技新发现:从动物外壳提炼的具有可生物降解特性的材料以及它的广泛用途。
66. C 段落大意题。考查对段落主题的理解和判断能力。根据第一段Harvard researchers have created a tough, lowcost, biodegradable…可以推知,选项C符合文意。
67. A 细节理解题。考查对文章特定细节的理解和判断能力。根据文章第二段…however, plastic’s very durability is raising questions about how appropriate it is for onetime products…可以推知,选项A符合文意。
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