单项选择题

Now a paper in Science argues that organic chemicals in the rock come mostly from ________ on earth rather than bacteria on Mars.

A．configuration
B．constitution
C．condemnation
D．contamination
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单项选择题
Throughout the year of 1939, there was a ________ rising rate of inflation in the United States. It reached to 10%.
A．firmly
B．sharply
C．constantly
D．roughly
单项选择题
A．repiaced forB．replaced byC．substituted forD．substituted with
A．repiaced for
B．replaced by
C．substituted for
D．substituted with
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