gre考试阅读真题解析(B)_GRE阅读

　　The synthesis is common in modern laboratories.

　　The synthesis occurs more readily in the atmosphere than in the ocean.

　　The synthesis easily produces the most complex organic molecules.

　　The synthesis is accelerated by the presence of oxygen-containing compounds.

　　25. The primary purpose of the passage is to

　　point out that theories about how life developed on Earth have changed little since 1953

　　warn of increasing levels of hydrogen, methane, and ammonia in the Earths atmosphere

　　describe the development since 1953 of some scientists understanding of how life began on Earth

　　demonstrate that the synthesis of life in the laboratory is too difficult for modern technology

　　describe how primitive atmospheric conditions produced the complex molecules of living organisms

　　26. It can be inferred from the passage that some scientists assume which of the following concerning larger, more complex molecules ?

　　The earliest atmosphere was formed primarily of these molecules.

　　Chemical processes involving these molecules proceeded much more slowly under primitive Earth conditions.

　　The presence of these molecules would necessarily precede the existence of simple organisms.

【gre考试阅读真题解析(B)】相关文章：

1 2 3 4 5 678 显示全文

上一篇：gre阅读练习每日一篇(四十七) 下一篇：gre阅读练习每日一篇(四十六)

GRE阅读 最新: GRE阅读陌生词汇的技巧
2016-03-01; GRE阅读题选项的原则
2016-03-01; 新GRE阅读经典句式盘点
2016-03-01; GRE阅读翻译练习
2016-03-01; GRE阅读主旨题解题技巧
2016-03-01; GRE阅读高分技巧
2016-03-01

网友关注: 托业考试考生经验交流分享; 托业(toeic)考试考场规则解析; 科技英语2004年小学组初赛试题答案及详解; 托业考试全过程及备考建议; 托业考试（TOEIC）必备词汇总结; 名师解析：托业考试新题型; 备考时间不多的在职人员; 科技英语2005年小学组初赛试题答案及详解; 科技英语2002年小学组初赛试题; 托业阅读常考词汇大收集（2）