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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单项选择题

The author is primarily concerned with describing ______.

A．research into tropical-forest biology on Barro 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

单项选择题

What does the last paragraph tell us

A．Andy Williams 'parents' divorce has some negative effects on him.
B．Andy Williams was rather popular because he used to be quite friendly.
C．Anti-bullying policies are adopted by all schools in Colorado.
D．Silence is strongly banned in schools.