单项选择题

According to the scientists, life came from ___________.

A．combination of energy and biochemical materials
B．combination of nucleic acid and amino molecules
C．nucleic acid molecules
D．amino acid molecules
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单项选择题
What are formed in the experiments in the first paragraph
A．Simple compounds of living things.
B．Simple matter named as amino acids.
C．Simple living organic molecules.
D．Simple dead organic molecules.
单项选择题
Scientists believe that when life on earth began, the earth atmosphere consisted of ___________.
A．oxygen and nitrogen
B．hydrogen, oxygen and nitrogen
C．hydrogen and its compounds
D．hydrogen, oxygen and their compounds
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