Part 6. Please read the following article and answer the following questions [source: Modified from AdyanceScience 8,2001121(2021)]Polymers shape human life but they also have been identified as pollutants in the oceans due to their long lifetime and lowdegradability. Recently, various researchers have studied the impact of (micro)plastics on marinc life. biodiversity. and potentialtoxicity. Even if the consequences are still heavily discussed. prevention of unnecessary waste is desired. Espccially, newly designedpolymers that degrade in seawater are discussed as potential alternatives to commodity polymers in certain applications.Biodegradable polymers that degrade in vivo (used for biomedical applications) or during composting often exhibit too slowdegradation rates in scawater. To datc, no comprehensive summary for the degradation performance of polymers in seawater has beenreported, nor are the studies for seawater-degradation following uniform standarcds. This review summarizes concepts. mechanisms.and other factors affecting the degradation process in seawater of'several biodegradable polymers or polymer blends. As most of suchmaterials cannot degrade or degrade tou slowly. strategies and innovative routes for the preparation of seawater-degradable polymerswith rapid degradation in natural environments are reviewed. It is believed that this selection will help to further understand and drivethe development of seawater-degradable polymers.
【題組】22. Which one is "unlikely" the keyword of the abstract? (3%)
(A) biodegradable polyesters
(B) seawater-degradable polymers
(C)mari e plastic pollution
(D)natural environment