) What has become a concern about plastic? ( )(本题2.5分) A. Using it properly. B. Producing it cheaply. C. Developing its properties quickly. , D. Evaluating its contributions fairly.

) What has become a concern about plastic? ( )(本题2.5分)
A. Using it properly.
B. Producing it cheaply.
C. Developing its properties quickly. ,
D. Evaluating its contributions fairly.

出自：平顶山学院-英语(专升本)-报刊阅读(专升本)

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