题目内容
9.Harvard researchers have created a tough,low-cost,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,made from shrimp ('虾) shells and proteins produced from silk,is called"shrilk."It is thin,clear,flexible and strong.A major benefit of the material is its biodegradability.Plastic's toughness and flexibility represented a revolution in materials science during the 1950s and'60s.Decades later,however,plastic's very durability (耐用性) is raising questions about how appropriate it is for one-time products such as plastic bags,or short-lived consumer goods,used in the home for a few years and then cast into a landfill where they will degrade for centuries.What is the point of making something that lasts 1,000years?
Shrilk not only will degrade in a landfill,but its basic components are used as fertilizer(肥料),and so will enrich the soil.
Shrilk has great potential,the 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 non-medical 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.
49.Paragraph I of the passage is mainly about shrilk'sC.
A.remarkable designB.interesting name
C.major featuresD.basic elements
50.What has become a concern about plastic?A
A.Using it properly.
B.Producing it cheaply.
C.Developing its properties quickly.
D.Evaluating its contributions fairly.
51.According to the inventors,shrilk has great potential partly becauseD.
A.it can help plastic degrade
B.it can be found in living things
C.its mass production has been realized
D.its raw materials are abundant in nature
52.Which of the following can be the best title for the passage?D
A.Recent Progress in Environmental Protection
B.Benefits of Insects in Scientific Research
C.The Harm of One-time Products
D.A Possible Alternative to Plastic.
分析 本文是一篇新闻报道,事物类说明文,讲述的主题是"shrilk",哈佛大学的研究人员仿照昆虫外壳研制出了一种既坚硬又廉价的物质.这种物质由虾壳和蚕丝提取物制作而成,可降解,非常环保.
解答 49.答案:C.主旨大意题.第一段第一句介绍了shrilk的主要特征,即tough,low-cost,biodegradable,而本句是本段的主题句.故选C.
50.答案:A.细节理解题.根据第二段的第二句Decades later,however,plastic's very durability is raising questions about how appropriate it is for one-time products such as plastic bags,or short-lived consumer goods,used in home for a few years and then cast into a landfill where they will degrade for centuries.可知,合理使用塑料成为一个倍受关注的问题.
51.答案:D.细节理解题.根据"Shrilk has great potential,the inventors said.Materials from which it is made are plentiful in nature,found in everything ranging from shrimp shells,insect bodies to living plants"可知,它之所以有潜力的原因是原材料在自然界很丰富.故选D.
52.答案:D.主旨大意题.根据全文内容知,本文是新闻报道,主要介绍的是一种新环保材料shrilk.故选D.
点评 本文是一篇新闻报道,题目涉及多道主旨大意题,细节理解题,做题时应结合文章上下文内容,仔细阅读原文,并根据所给选项的含义进行分析,从而得出正确答案.切记胡乱猜测,一定要做到有理有据.

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