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 discovery of a new type of ceratopsian dinosaur suggests ceratopsians ______.
A．migrated to North America around 70--80 million years ago
B．arrived in Asia from North America about 90 million years ago
C．originated in Asia and later migrated to North America
D．could have moved to Asia from North America long ago
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 researc
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