問題詳情

15.As plastics______to micro level and enter the food chain in our oceans, it's a problem that affects all of us and can only be solved by all of us.
(A)break up
(B) break down
(C) shut down
(D) turn down

參考答案

答案:B
難度:適中0.552083
統計:A(16),B(53),C(5),D(22),E(0)

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