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.
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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
单项选择题
If a company wants its new pay structure to be successful, it is necessary to __________.
A．give the workers extra pay to encourage them
B．share the same opinion between the Trade Union and the employers
C．consult some problems associated with pay
D．adopt a special way to evaluate the performance of its employees
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