問題詳情
【題組】30. According to the text, recycling is only possiblewhen:
(A) there is enough clean material.
(B) there is a small amount of clean material.
(C) it is monitored by the government.
(D) different collection schemes operate.
參考答案
答案：A
難度：困難0.285714
統計：A(2),B(2),C(2),D(1),E(0)