解析库 > 绝密机经模考三
When in 1980 the father and son pair of Louis and Walter Alvarez and their colleagues linked the end Cretaceoure extinction to a catastrophic extraterrestrial impact, they were met with skepticism by most paleontologists, which was(i)______given that geological training since the mid-1800s had emphasized the primacy of (ii)_______ .
- discernible causes
- gradual processes
- reversible changes
unsurprising , gradual processes 显示答案