单项选择题

The author is primarily concerned with describing ______.

A．research into tropical-forest biology on Barco Colorado Island
B．how the whole ecosystems can depend on the survival of a single species
C．the life cycle Of the fig wasp
D．the importance of forests to the human race
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单项选择题
Which of the following statements can be inferred from the passage
A．Forests could not function without the fig wasp.
B．Forest will recover no matter what we do to them.
C．If man does not acquire an understanding of his relationship to the forest and other habitats there will be an ecological disaster.
D．Scientists' long-term contribution to the quality of life depends on their fig wasp research.
单项选择题
The author would like to see ______.
A．more buildings erected in the forests
B．fig trees planted in all forests
C．scientific efforts diverted to bomb making
D．the preservation of as many diverse species as possible
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