单项选择题

The author's attitude to the ecological situation of the tropical forests is ______.

A．alarm and urgency
B．indifference and callousness
C．puzzlement and wonder
D．detached and scholarly
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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
How do you understand the word mayhem in Paragraph 1
A．Firing.
B．Bombing.
C．Disaster.
D．Violent disorder.
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