单项选择题

A．He forgot.
B．He didn’t have enough money.
C．He was too busy.
D．He didn’t have lunch.
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单项选择题
A．Positive.B．Negative.C．Neutral.D．Uncertain.
A．Positive.
B．Negative.
C．Neutral.
D．Uncertain.
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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