問題詳情

第四大題 綜合測驗：20% (A.)Lighter than metal and more durable than glass, plastic is an indispensable consumercommodity. Yet, common plastic production requires fossil fuels and releases greenhousegases. Bioplastic attempts to address this issue. 51 , bioplastic sounds wonderful. Madeout of renewable resources such as corn starch, vegetable fats and oils, bioplastic is generallybiodegradable and thus environmentally-friendly 52 normal plastic. Less greenhouse gasis released during production, and incinerating bioplastic doesn’t create too much toxic fumes.     In truth, bioplastic has problems of its own. Some types can only biodegrade in certainenvironments. For example, starch-based bioplastic takes about 47 days to break down andrequires an environment with high humidity and a stable 58-70 degrees Celsius. The averageperson can’t just compost it in his backyard with other organic matter. 53 , bioplastic mustbe recycled separately from conventional plastic. Mixing the two creates an unreusableproduct. This makes the recycling process 54 harder and labor-intensive. Nevertheless,finding a natural alternative to plastic is a worthwhile pursuit. Indeed, bioplastic continues torise in popularity, and the industry is 55 to double by 2025. Still, there are severalobstacles to overcome before bioplastic can truly be considered a plastic replacement.
51.
(A) Before long
(B) Better yet
(C) Against all odds
(D) On the surface

參考答案

答案：D
難度：適中0.5
統計：A(0),B(0),C(0),D(0),E(0)

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