单项选择题

Now a paper 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
She knew who wrote the letter, so without opening it she tore it into pieces ______.
A．in excitement
B．in disappointment
C．in disgust
D．in expectation
单项选择题
There is no known cure for SARS, but doctors are developing ways to help sufferers ______ it.
A．retard
B．eliminate
C．dispense
D．handle
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