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GRE阅读模拟在线练习附答案一百八十六

2019-01-20 15:24:00来源：网络

　　对于GRE阅读部分，最好的练习资料就是模拟资料。通过模拟练习，可以让大家更好地发现自己在备考中的不足，重点攻克自己的短板内容，有效的提升阅读分数。下面新东方在线GRE频道为大家整理了详细的内容，供大家参考。

　　点击查看》》》【GRE阅读真题在线练习附答案汇总】

　　The dark regions in the starry night sky are not pockets in the universe that are devoid of stars as had long been thought. Rather, they are dark because of interstellar dust that hides the stars behind it. Although its visual effect is so pronounced, dust is only a minor constituent of the material, extremely low in density, that lies between the stars. Dust accounts for about one percent of the total mass of interstellar matter. The rest is hydrogen and helium gas, with small amounts of other elements. The interstellar material, rather like terrestrial clouds, comes in all shapes and sizes. The average density of interstellar material in the vicinity of our Sun is 1,000 to 10,000 times less than the best terrestrial laboratory vacuum. It is only because of the enormous interstellar distances that so little material per unit of volume becomes so significant. Optical astronomy is most directly affected, for although interstellar gas is perfectly transparent, the dust is not.

　　According to the passage, which of the following is a direct perceptual consequence of interstellar dust?

　　A.Some stars are rendered invisible to observers on Earth.

　　B.Many visible stars are made to seem brighter than they really are.

　　C.The presence of hydrogen and helium gas is revealed.

　　D.The night sky appears dusty at all times to observers on Earth.

　　E.The dust is conspicuously visible against a background of bright stars.

　　It can be inferred from the passage that the density of interstellar material is

　　A.higher where distances between the stars are shorter

　　B.equal to that of interstellar dust

　　C.unusually low in the vicinity of our Sun

　　D.independent of the incidence of gaseous components

　　E.not homogeneous throughout interstellar space

　　It can be inferred from the passage that it is because space is so vast that

　　A.little of the interstellar material in it seems substantial

　　B.normal units of volume seem futile for measurements of density

　　C.stars can be far enough from Earth to be obscured even by very sparsely distributed matter

　　D.interstellar gases can, for all practical purposes, be regarded as transparent

　　E.optical astronomy would be of little use even if no interstellar dust existed

本文关键字: GRE阅读 GRE阅读练习

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