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Micro plastics have become a severe pollution threat.D.Developing an alternative for micro plastics is urgent.13. What’s the major concern of researchers choosing silk asalternat ive?BA. It is economical. B. It is biodegradable.____C. It is widely available.D. It is skin-friendly.

35. Which of the following is the best title for the text?A.Explainer: The Nico-Teen BrainB.Tobacco, Nicotine, and E-CigarettesC.How Nicotine Affects Memory and LearningD.Nicotine Addiction: Symptoms and Treatments