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 low­cost, 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.

　　66. Paragraph 1 of the passage is mainly about shrilk's ________.

　　A．remarkable design

　　B．interesting name

　　C．major features

　　D．basic elements

　　67. What has become a concern about plastic?

　　A．Using it properly.

　　B．Producing it cheaply.

　　C．Developing its properties quickly.

　　D．Evaluating its contributions fairly.

　　68. According to the inventors，shrilk has great potential partly because ________.

　　A．it can help plastic degrade

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