18. Which of the following is NOT biodegradable?
(A) orange peels
(B) leftover foods
(C) plastic utensils
(D) corn cobs
答案:登入後查看
統計: A(6), B(17), C(311), D(6), E(0) #3238028
統計: A(6), B(17), C(311), D(6), E(0) #3238028