更多"Catastrophic volcanic eruptions in "的相关试题:
[单项选择]Catastrophic volcanic eruptions in Europe may have culled Neanderthals to the point where they couldn’t bounce back, according to a controversial new theory. Modern humans, though, squeaked by, thanks to fallback populations in Africa and Asia, researchers say.
About 40,000 years ago in what we now call Italy and the Caucasus Mountains, which straddle Europe and Asia, several volcanoes erupted in quick succession, according to a new study to be published in the October issue of the journal Current Anthropology. It’s likely the eruptions reduced or wiped out local bands of Neanderthals and indirectly affected farther-flung populations, the team concluded after analyzing pollen and ash from the affected area. The researchers examined sediments layer from around 40,000 years ago in Russia’s Mezmaiskaya Cave and found that the more volcanic ash a layer had, the less plant pollen it contained.
"We tested all the layers for this volcanic ash signature. The most volcanic-ash-rich la
A. leap suddenly
B. recover from a terrible situation
C. refuse to accept
D. come back after being refused
[单项选择]What beneficial result does the volcanic ash have（ ）.
A. It served as a fertilizer for crops.
B. It formed a new mountain.
C. It destroyed various insect pests.
[填空题]People in Europe have had more advanced technology in using wind power than Americans.
[简答题]Within a few short years, girl in Europe have become heavier smokers than boys, for reasons experts still fail to understand (passage 1)
[填空题]The demographic change in rural Europe will have a negative effect on every aspect of the local economy from tourist industry income to agricultural outputs.
[填空题]More than two million people in Europe now have fibre broadband direct to their home, suggests a survey.
The latest figures on superfast broadband delivered by fibre to the home (FTTH) shows 18% growth over the last survey compiled in late 2008.
The continued growth suggests that the global economic downturn has not hit plans to build a fibre infrastructure (基础设).
Sweden tops the list of nations rolling out the technology, with 10.9% of its broadband customers using fibre.
Karel Helsen, president of Europe’s Fibre-To-The-Home Council, said the growth matched predictions that were revised when the credit crunch (信用紧缩) started to make itself felt.
"The numbers in 2009 are in line with the latest forecasts," said Mr. Helsen.
By 2012, the FTTH Council expects that 13 million people across 35 European nations will have their broadband delivered by fibre. Such services would start at speeds of 100 megabits per second (mbps), said Mr. Helsen.
A
