对环境危害极大的“酸雨”中的主要成分是CO2。
参考答案：错
心脏破裂最常见的部位是（）
A.右心室
B.左心房
C.右心房
D.左心室
E.全心
I've never read a better book than this one._____, it is the best one that I have ever read. [ ]
A. Since then
B. In other words
C. At times
D. In some ways
