The disappearance of dinosaurs is not necessarily caused by astronomical incidents. But _________explanations are hard to find.
A. |
alternative |
B. |
aggressive |
C. |
ambiguous |
D. |
apparent |
推荐套卷
The disappearance of dinosaurs is not necessarily caused by astronomical incidents. But _________explanations are hard to find.
A. |
alternative |
B. |
aggressive |
C. |
ambiguous |
D. |
apparent |