以下将为正在备战GMAT考试的同学们整理一些经典的GMAT阅读试题，并分多个合集推出，希望能够为正在备考GMAT考试的考生提供或多或少的帮助。

　　27. GWD-27-Q10-Q12 黑洞存在的研究

　　Astronomers theorize that a black

　　hole forms when a massive object

　　shrinks catastrophically under its own

　　Line gravity, leaving only a gravitational

　　(5)field so strong that nothing escapes it.

　　Astronomers must infer the existence

　　of black holes, which are invisible,

　　from their gravitational influence on

　　the visible bodies surrounding them.

　　(10)For example, observations indicate

　　that gas clouds in galaxy M87 are

　　whirling unusually fast about the gal-

　　axy’s center. Most astronomers

　　believe that the large concentration

　　(15)of mass at the galaxy’s center is a

　　black hole whose gravity is causing

　　the gas to whirl. A few skeptics have

　　argued that the concentration of mass

　　necessary to explain the speed of the

　　(20)whirling gas is not necessarily a black

　　hole: the concentration in M87 might

　　be a cluster of a billion or so dim stars.

　　The same hypothesis might have

　　been applied to the galaxy NGC 4258,

　　(25)but the notion of such a cluster’s

　　existing in NGC 4258 was severely

　　undermined when astronomers mea-

　　sured the speed of a ring of dust and

　　gas rotating close to the galaxy’s

　　(30)center. From its speed, they calcu-

　　lated that the core’s density is more

　　than 40 times the density estimated

　　for any other galaxy. If the center of

　　NGC 4258 were a star cluster, the

　　(35)stars would be so closely spaced

　　that collisions between individual

　　stars would have long ago torn the

　　cluster apart.

　　以上就是本期GMAT试题的所有内容，考生可以此为据并进行针对性的练习，逐步掌握GMAT阅读的解题规律及技巧，以达到迅速提高GMAT考试成绩的目的。 相关链接：

1.GMAT考试资料：GWD试题合集（四十八）

2.GMAT考试资料：GWD试题合集（四十七）

3.GMAT考试资料：GWD试题合集（四十六）

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