单项选择题

A．Positive.
B．Negative.
C．Neutral.
D．Uncertain.
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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
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
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