单项选择题

The passage focuses on ______.

A．dincosaur’s geographical location
B．shifting views of dinosaurs
C．migration patterns of dinosaurs
D．geologic activity of Earth
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单项选择题
The author’s attitude to the ecological situation of the tropical forests is ______.
A．Mann and urgency
B．indifference and callousness
C．puzzlement and wonder
D．detached and scholarly
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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