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GRE阅读题目解析:初始地球条件

2017-06-19 09:53:00来源：网络

　　【GRE阅读题目解析:初始地球条件】GRE考试考什么？GRE阅读是重点。新东方在线GRE频道为大家带来GRE阅读题目解析:初始地球条件，答案见下一页，希望对大家GRE备考有所帮助。更多精彩尽请关注新东方在线GRE频道!

　　查看全部：GRE阅读答案解析(汇总)

　　GRE阅读题目解析:初始地球条件

　　P1

　　Since 1953, many experimental attempts to synthesize the chemical constituents of life under "primitive Earth conditions" have demonstrated that a variety of the complex molecules currently making up living organisms could have been present in the early ocean and atmosphere, with only one limitation: such molecules are synthesized far less readily when oxygen-containing compounds dominate the atmosphere. Therefore some scientists postulate that the Earth's earliest atmosphere, unlike that of today, was dominated by hydrogen, methane, and ammonia. From these studies, scientists have concluded that the surface of the primitive Earth was covered with oceans containing the molecules fundamental to life. Although, at present, scientists cannot explain how these relatively small molecules combined to produce larger, more complex molecules, some scientists have precipitously ventured hypotheses that attempt to explain the development, from larger molecules, of the earliest self-duplicating organisms.(138 words)

　　1. According to the passage, which of the following can be inferred about the process by which the chemical constituents of life were synthesized under primitive Earth conditions?

　　(A) The synthesis is unlikely to occur under current atmospheric conditions

　　(B) The synthesis is common in modern laboratories.

　　(C)The synthesis occurs more readily in the atmosphere than in the ocean.

　　(D)The synthesis easily produces the most complex organic molecules.

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

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

　　(A) The earliest atmosphere was forward primarily of these molecules.

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

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

　　(D) Experimental techniques will never be sufficiently sophisticated to produce in the laboratory simple organisms from these chemical constituents.

　　(E) Explanations could easily be developed to explain how simple molecules combined to form these more complex ones.

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