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
Whether you live to eat or eat to live, food is a major （）in every family's budget.

A．nutrition
B．expenditure
C．routine
D．provision
单项选择题
The police were alerted that the escaped criminal might be in the （）

A．vain
B．vicinity
C．court
D．jail
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