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
By signing the lease we made a ________ to pay a rent of $150 a week.
A．conception
B．commission
C．commitment
D．confinement
单项选择题
The Christmas tree was decorated with shining ________ such as colored lights and glass balls.
A．ornaments
B．luxuries
C．exhibits
D．complements
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