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

　　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.

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