单项选择题

At the same time, the _______ causes for known declines and disappearances of species often involves experimentation, data analysis, and scientific detective work.

A．identifying
B．pondering
C．nourishing
D．simplifying
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Each individual is _______ with the essential defenses to ward off bacterial invasion.
A．endowed
B．enriched
C．enlightened
D．entailed
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She was very interested in the work of certain charities, and made a regular _______ to them.
A．tribe
B．attribute
C．contribution
D．tribute
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