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
The word disciplines in the first sentence of Paragraph 1 means ________.
A．rules
B．systems
C．practice
D．subjects of study
单项选择题
The following actions were taken by GE's management to help its out-of-work employees except ________.
A．sending letters to nationally based personnel managers
B．placing advertisements in local newspapers
C．selling telephones to all affected employees
D．providing them with information about job openings
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