单项选择题

The environment is everything that surrounds us; plants, animals, buildings, country, air, water, everything that can affect us in any way.

A．excessively
B．distinctly
C．approximately
D．virtually
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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
The word disciplines in the first sentence of Paragraph 1 means ________.
A．rules
B．systems
C．practice
D．subjects of study
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