GRE阅读练习每日一篇(五十三)_GRE阅读

GRE阅读练习每日一篇(五十三)

　　The all-volunteer character of the present armed forces

　　The past service records of women who had assignments functionally equivalent to men s assignments

　　The level of awareness on the part of the larger society of military issues

　　A decline in the proportion of deterrence oriented noncombat assignments

　　Restrictive past policies governing the military assignments open to women

　　20. The dramatic gains for women and the attitude, as described in lines 11-12, of a significant portion of the larger society are logically related to each other inasmuch as the author puts forward the latter as

　　a public response to achievement of the former

　　the major reason for absence of the former

　　a precondition for any prospect of achieving the former

　　a catalyst for a further extension of the former

　　a reason for some of the former being lost again

　　Of the thousands of specimens of meteorites found on Earth and known to science, only about 100 are igneous; that is, they have undergone melting by volcanic action at some time since the planets were first formed. These igneous meteorites are known as achondrites because they lack chondrules small stony spherules found in the thousands of meteorites composed primarily of unaltered minerals that condensed from dust and gas at the origin of the solar system. Achondrites are the only known samples of volcanic rocks originating outside the Earth-Moon system. Most are thought to have been dislodged by interbody impact from asteroids, with diameters of from 10 to 500 kilometers, in solar orbit between Mars and Jupiter.