新GRE阅读机经：恐龙灭绝和行星撞地球(逻辑).

　　下面是小编为大家整理的新GRE机经的阅读部分，这篇是关于“恐龙灭绝和行星撞地球”的新GRE阅读机经，希望可以帮助各位考生打开阅读思路，提高新GRE阅读能力。

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　　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.

　　以上就是关于“恐龙灭绝和行星撞地球”的新GRE阅读机经，希望能够帮助各位考生更好地备考新GRE。机经的作用是非常重要的，有很多机经会反复考到，大家可以进行认真阅读，从中推断出出题人的出题思路，总结出新GRE阅读的解题，做到杀G成功!