一道GRE逻辑不会18.恐龙灭绝和行星撞地球(逻辑)Iridium,a hard,whitish metal simil
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一道GRE逻辑不会
18.恐龙灭绝和行星撞地球(逻辑)
Iridium,a hard,whitish metal similar to platinum,is extremely rare on Earth.Extremely high
concentrations of iridium on Earth result from only two scenarios:massive volcanic eruptions that
release iridium from deep within the Earth and meteorites that shower down on Earth from space.
When scientists found concentrations of iridium 30 times higher than normal in rock stratum from 65
million years ago,they concluded that a massive meteor or comet hit the Earth and caused the massive
extinction of the dinosaurs.
Which of the following,if true,most strongly supports the scientist’s conclusion?
A.Volcanoes massive enough to generate high concentrations of iridium are very rare.
B.Massive volcanic eruptions occurred frequently 80 million years ago.
C.Most scientists support the hypothesis that a cosmic impact wiped out the dinosaurs.
D.The massive extinction that occurred 70 million years ago killed not only the dinosaurs but also 70
percent of all life on Earth.
E.A comet struck the earth some 120 million years ago,but no widespread extinction occurred.
18.恐龙灭绝和行星撞地球(逻辑)
Iridium,a hard,whitish metal similar to platinum,is extremely rare on Earth.Extremely high
concentrations of iridium on Earth result from only two scenarios:massive volcanic eruptions that
release iridium from deep within the Earth and meteorites that shower down on Earth from space.
When scientists found concentrations of iridium 30 times higher than normal in rock stratum from 65
million years ago,they concluded that a massive meteor or comet hit the Earth and caused the massive
extinction of the dinosaurs.
Which of the following,if true,most strongly supports the scientist’s conclusion?
A.Volcanoes massive enough to generate high concentrations of iridium are very rare.
B.Massive volcanic eruptions occurred frequently 80 million years ago.
C.Most scientists support the hypothesis that a cosmic impact wiped out the dinosaurs.
D.The massive extinction that occurred 70 million years ago killed not only the dinosaurs but also 70
percent of all life on Earth.
E.A comet struck the earth some 120 million years ago,but no widespread extinction occurred.
选b啊.
原文说那个东西多就两种原因,一个是火山喷发,一个外太空来.那么,因为现在的比65百万年前的高,那么推断是外太空的陨石撞的.
b说了,80百万年前经常发生火山喷发,既然80百万年前火山经常喷发都没引起这种金属增多,而65百万年前却增多了,那就肯定是来自外太空了啊.所以,这个支持了科学家的推断.
我真觉得我该重考一次gre啊.
原文说那个东西多就两种原因,一个是火山喷发,一个外太空来.那么,因为现在的比65百万年前的高,那么推断是外太空的陨石撞的.
b说了,80百万年前经常发生火山喷发,既然80百万年前火山经常喷发都没引起这种金属增多,而65百万年前却增多了,那就肯定是来自外太空了啊.所以,这个支持了科学家的推断.
我真觉得我该重考一次gre啊.
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