填空题
- A．than more recent ones
- B．the killing efficiency for older eruptions
- C．has remained controversial
- D．Wignall's calculations as acceptable
- E．has been known to us all
- F．his ideas
填空题
Older eruptions were more devastating 1.
填空题
The Permian extinction is used to illustrate 1.
填空题
The cause of the extinction of dinosaurs 1.
填空题
Courtillor rejects 1.