問題詳情
21. Carbon Dioxide may be absorbed by trees or water bodies, or it may stay in the atmosphere when _____, while it is only in the atmosphere that chlorofluorocarbons find their home.
(A) cars that release emissions
(B)emissions are released by cars
(C) by releasing emissions from cars
(D) released from car emissions
參考答案
答案：D
難度：適中0.538462
統計：A(2),B(3),C(0),D(7),E(0)