单项选择题

The passage focuses on ______.

A．dinosaur’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
Decentralization is best defined as ______.
A．movement from the central city to rural areas
B．movement from the central city to the suburbs
C．disorderly expansion of the central city
D．shrinking of metropolitan
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